dnl configure.in
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
dnl Copyright (C) 1993-2012 John W. Eaton
### 
### This file is part of Octave.
### 
### Octave is free software; you can redistribute it and/or modify it
### under the terms of the GNU General Public License as published by the
### Free Software Foundation; either version 3 of the License, or (at
### your option) any later version.
### 
### Octave is distributed in the hope that it will be useful, but WITHOUT
### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
### FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
### for more details.
### 
### You should have received a copy of the GNU General Public License
### along with Octave; see the file COPYING.  If not, see
### <http://www.gnu.org/licenses/>.

### Preserve CFLAGS and CXXFLAGS from the environment before doing
### anything else because we don't know which macros might call
### AC_PROG_CC or AC_PROG_CXX.

EXTERN_CFLAGS="$CFLAGS"
EXTERN_CXXFLAGS="$CXXFLAGS"

AC_INIT([GNU Octave], [3.6.2], [http://octave.org/bugs.html], [octave])

dnl PACKAGE_VERSION is set by the AC_INIT VERSION arg
OCTAVE_VERSION="$PACKAGE_VERSION"
OCTAVE_API_VERSION_NUMBER="48"
OCTAVE_API_VERSION="api-v$OCTAVE_API_VERSION_NUMBER+"
OCTAVE_RELEASE_DATE="2012-05-31"
OCTAVE_COPYRIGHT="Copyright (C) 2012 John W. Eaton and others."
AC_SUBST(OCTAVE_VERSION)
AC_SUBST(OCTAVE_API_VERSION_NUMBER)
AC_SUBST(OCTAVE_API_VERSION)
AC_SUBST(OCTAVE_RELEASE_DATE)
AC_SUBST(OCTAVE_COPYRIGHT)

AC_REVISION($Revision: 1.603 $)
AC_PREREQ([2.62])
AC_CONFIG_SRCDIR([src/octave.cc])
AC_CONFIG_HEADER([config.h])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])

AM_INIT_AUTOMAKE([1.11 tar-ustar])

OCTAVE_HOST_TYPE

AC_DEFINE(OCTAVE_SOURCE, 1, [Define if this is Octave.])
  
dnl FIXME -- we should probably only generate this file if it is missing.
### Produce unistd.h for MSVC target, this simplifies changes in
### Octave source tree and avoid problems with lex-generated code.
case "$canonical_host_type" in
  *-*-msdosmsvc)
    AC_MSG_NOTICE([Generating replacement for <unistd.h> for MSVC])
    cat << \EOF > unistd.h
/* File generated by configure script. */
#include <direct.h>
#include <io.h>
#include <process.h>
EOF
    CPPFLAGS="-I. $CPPFLAGS"
    ;;
esac

AC_USE_SYSTEM_EXTENSIONS

### Check for MSVC
have_msvc=no
case "$canonical_host_type" in
  *-*-msdosmsvc)
    have_msvc=yes
  ;;
  *-*-mingw*)
    AC_MSG_CHECKING([for MSVC compiler])
    AC_PREPROC_IFELSE([AC_LANG_SOURCE([
#ifndef _MSC_VER
#error "Not MSVC compiler"
#endif
])], have_msvc=yes, have_msvc=no)
    AC_MSG_RESULT([$have_msvc])
  ;;
esac

### Path separator.
sepchar=:
AC_ARG_WITH(sepchar,
  [AS_HELP_STRING([--with-sepchar=<char>],
     [use <char> as the path separation character])])
case $with_sepchar in
  yes | "")
    case "$canonical_host_type" in
      *-*-mingw* | *-*-msdosmsvc)
        sepchar=';'
        ;;
      esac
    ;;
  no)
    AC_MSG_ERROR([You are required to define a path separation character])
    ;;
  *)
    sepchar=$with_sepchar
    ;;
esac
AC_SUBST(sepchar)
AC_DEFINE_UNQUOTED(SEPCHAR, ['$sepchar'], [Define this to be the path separator for your system, as a character constant.])
AC_DEFINE_UNQUOTED(SEPCHAR_STR, ["$sepchar"], [Define this to the path separator, as a string.])

### some defaults

OCTAVE_SET_DEFAULT(man1dir, '$(mandir)/man1')
OCTAVE_SET_DEFAULT(man1ext, '.1')
OCTAVE_SET_DEFAULT(doc_cache_file, '$(octetcdir)/doc-cache')
OCTAVE_SET_DEFAULT(infofile, '$(infodir)/octave.info')
OCTAVE_SET_DEFAULT(octincludedir, '$(includedir)/octave-$(version)/octave')
OCTAVE_SET_DEFAULT(fcnfiledir, '$(datadir)/octave/$(version)/m')
OCTAVE_SET_DEFAULT(localfcnfiledir, '$(datadir)/octave/site/m')
OCTAVE_SET_DEFAULT(localapifcnfiledir,
  '$(datadir)/octave/site/$(api_version)/m')
OCTAVE_SET_DEFAULT(localverfcnfiledir, '$(datadir)/octave/$(version)/site/m')
OCTAVE_SET_DEFAULT(octetcdir, '$(datadir)/octave/$(version)/etc')
OCTAVE_SET_DEFAULT(octlibdir, '$(libdir)/octave/$(version)')
OCTAVE_SET_DEFAULT(archlibdir,
  '$(libexecdir)/octave/$(version)/exec/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localarchlibdir,
  '$(libexecdir)/octave/site/exec/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localapiarchlibdir,
  '$(libexecdir)/octave/$(api_version)/site/exec/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localverarchlibdir,
  '$(libexecdir)/octave/$(version)/site/exec/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(octfiledir,
  '$(libdir)/octave/$(version)/oct/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localoctfiledir,
  '$(libdir)/octave/site/oct/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localapioctfiledir,
  '$(libdir)/octave/site/oct/$(api_version)/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(localveroctfiledir,
  '$(libdir)/octave/$(version)/site/oct/$(canonical_host_type)')
OCTAVE_SET_DEFAULT(imagedir, '$(datadir)/octave/$(version)/imagelib')

### Find pkg-config executable (sets $PKG_CONFIG)

PKG_PROG_PKG_CONFIG

### Make configure args available for other uses.

config_opts=$ac_configure_args
AC_SUBST(config_opts)

### Make it possible to have Octave's array and matrix classes do bounds
### checking on element references.  This slows some operations down a
### bit, so it is turned off by default.

BOUNDS_CHECKING=false
AC_ARG_ENABLE(bounds-check,
  [AS_HELP_STRING([--enable-bounds-check],
     [bounds checking for indexing in internal array classes (default is no)])],
  [if test "$enableval" = yes; then BOUNDS_CHECKING=true; fi], [])
if $BOUNDS_CHECKING; then
  AC_DEFINE(BOUNDS_CHECKING, 1, [Define to use internal bounds checking.])
fi

USE_OCTAVE_ALLOCATOR=false
AC_ARG_ENABLE(octave-allocator,
  [AS_HELP_STRING([--enable-octave-allocator],
     [use the obsolete octave_allocator class for many of Octave's objects (mostly octave_value types).  You probably do NOT want to enable this feature.  (default is no)])],
  [if test "$enableval" = yes; then USE_OCTAVE_ALLOCATOR=true; fi], [])
if $USE_OCTAVE_ALLOCATOR; then
  AC_DEFINE(USE_OCTAVE_ALLOCATOR, 1, [Define to use octave_allocator class.])
fi

USE_ATOMIC_REFCOUNT=false
AC_ARG_ENABLE(atomic-refcount,
  [AS_HELP_STRING([--enable-atomic-refcount],
     [use atomic operations for internal reference counting. This is required for thread-safe behavior.  (default is no)])],
  [if test "$enableval" = yes; then USE_ATOMIC_REFCOUNT=true; fi], [])
if $USE_ATOMIC_REFCOUNT; then
  AC_DEFINE(USE_ATOMIC_REFCOUNT, 1, [Define to use atomic operations for reference counting.])
fi

### Make it possible to disable running Make in the doc directory.
### Useful for building on systems without TeX, for example.
DOCDIR=doc
AC_ARG_ENABLE(docs,
  [AS_HELP_STRING([--enable-docs], [build documentation (default is yes)])],
  [if test "$enableval" = no; then
     DOCDIR=
     warn_docs="building documentation disabled; make dist will fail"
     AC_MSG_WARN([$warn_docs])
   fi], [])
AC_SUBST(DOCDIR)
AM_CONDITIONAL([AMCOND_BUILD_DOCS], [test -n "$DOCDIR"])

### If possible, use a 64-bit integer type for array dimensions and indexing.

USE_64_BIT_IDX_T=false
OCTAVE_IDX_TYPE=int
AC_ARG_ENABLE(64,
  [AS_HELP_STRING([--enable-64],
     [(EXPERIMENTAL) use 64-bit integers for array dimensions and indexing])],
  [if test "$enableval" = yes; then USE_64_BIT_IDX_T=true; fi], [])
if $USE_64_BIT_IDX_T; then
  AC_CHECK_SIZEOF(void *)
  AC_CHECK_SIZEOF(int)
  AC_CHECK_SIZEOF(long)
  if test $ac_cv_sizeof_void_p -eq 8; then
    if test $ac_cv_sizeof_int -eq 8; then
      OCTAVE_IDX_TYPE=int
    elif test $ac_cv_sizeof_long -eq 8; then
      OCTAVE_IDX_TYPE=long
      AC_DEFINE(IDX_TYPE_LONG, 1, [Define to 1 if octave index type is long])
    else
      warn_64_bit="no suitable type found for octave_idx_type so disabling 64-bit features"
      AC_MSG_WARN([$warn_64_bit])
      USE_64_BIT_IDX_T=false
    fi
  else
    warn_64_bit="pointers are not 64-bits wide so disabling 64-bit features"
    AC_MSG_WARN([$warn_64_bit])
    USE_64_BIT_IDX_T=false
  fi
fi
AC_SUBST(OCTAVE_IDX_TYPE)
AC_DEFINE_UNQUOTED(OCTAVE_IDX_TYPE, $OCTAVE_IDX_TYPE,
  [Define to the type of octave_idx_type (64 or 32 bit signed integer)])
if $USE_64_BIT_IDX_T; then
  AC_DEFINE(USE_64_BIT_IDX_T, 1, [Define if using 64-bit integers for array dimensions and indexing])
fi
AC_SUBST(USE_64_BIT_IDX_T)

### It seems that there are some broken inline assembly functions in
### the GNU libc.  Since I'm not sure how to test whether we are using
### GNU libc, just disable them for all platforms.

AC_MSG_NOTICE([defining __NO_MATH_INLINES avoids buggy GNU libc exp function])
AC_DEFINE(__NO_MATH_INLINES, 1, [Define if your version of GNU libc has buggy inline assembly code for math functions like exp.])

### See which C++ compiler to use (we expect to find g++).

AC_PROG_CXX
AC_PROG_CXXCPP

### Do special things for g++.

gxx_version=`$CXX -v 2>&1 | grep "^.*g.. version" | \
  sed -e 's/^.*g.. version *//' -e 's/cygnus-//' -e 's/egcs-//' -e 's/ .*//'`

case "$gxx_version" in
  1.* | 2.[[0123456789]].* | 3.[[01234]].*)
    AC_MSG_ERROR([g++ version $gxx_version will probably fail to compile Octave]
)
  ;;
esac

CXX_VERSION=
if test -n "$gxx_version"; then
  CXX_VERSION="$gxx_version"
fi
AC_SUBST(CXX_VERSION)

OCTAVE_CXX_NEW_FRIEND_TEMPLATE_DECL
OCTAVE_CXX_ISO_COMPLIANT_LIBRARY
OCTAVE_CXX_BROKEN_REINTERPRET_CAST

### See which C compiler to use (we expect to find gcc).

AC_PROG_CC
AC_PROG_CPP
AC_PROG_GCC_TRADITIONAL

### gnulib

gl_EARLY
gl_INIT

### Do special things for gcc.

gcc_version=`$CC -v 2>&1 | grep "^.*gcc version" | \
  sed -e 's/^.*g.. version *//' -e 's/cygnus-//' -e 's/egcs-//'`
case "$gcc_version" in
  [12].*)
    warn_gcc_version="gcc version $gcc_version is likely to cause problems"
    AC_MSG_WARN([$warn_gcc_version])
  ;;
esac

CC_VERSION=
if test -n "$gcc_version"; then
  CC_VERSION="$gcc_version"
fi
AC_SUBST(CC_VERSION)

### The flag to create dependency varies depending on the compier.

# Assume GCC.
INCLUDE_DEPS=true
DEPEND_FLAGS="-M"
DEPEND_EXTRA_SED_PATTERN=""
if test "$GCC" = yes; then
  true
else
  case "$canonical_host_type" in
    sparc-sun-solaris2* | i386-pc-solaris2*)
      DEPEND_FLAGS="-xM1"
      DEPEND_EXTRA_SED_PATTERN="-e '/\/opt\/SUNWspro/d'"
    ;;
    *-*-msdosmsvc)
    ;;
    *-*-mingw*)
      if test "$have_msvc" = "no"; then
        INCLUDE_DEPS=false
      fi
    ;;
    *)
      INCLUDE_DEPS=false
    ;;
  esac
fi
AC_SUBST(INCLUDE_DEPS)
AC_SUBST(DEPEND_FLAGS)
AC_SUBST(DEPEND_EXTRA_SED_PATTERN)

AX_PTHREAD
### Include pthread libs and flags here in case other tests need them.
### They seem to be required for the OpenGL tests on Debian systems.
LIBS="$PTHREAD_LIBS $LIBS"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

AC_PATH_X
if test "$have_x" = "yes"; then
  AC_DEFINE(HAVE_X_WINDOWS, 1, [Define if you have X11])

  if test "$x_includes" != "NONE"; then
    X11_INCFLAGS="$x_includes"
  fi
  AC_SUBST(X11_INCFLAGS)

  if test -z $x_libraries; then
    AC_CHECK_LIB(X11, XrmInitialize, [X11_LIBS=-lX11], [X11_LIBS=])
  elif test $x_libraries != "NONE"; then
    AC_CHECK_LIB(X11, XrmInitialize, 
      [X11_LIBS="-L$x_libraries -lX11"], [X11_LIBS=], "-L$x_libraries")
  fi
  AC_SUBST(X11_LIBS)
fi

### On MacOSX system the Carbon framework is used to determine ScreenSize
OCTAVE_HAVE_FRAMEWORK(Carbon, [#include <Carbon/Carbon.h>], [CGMainDisplayID ()],
  [have_framework_carbon="yes"], [have_framework_carbon="no"])
if test $have_framework_carbon = "yes"; then
  AC_DEFINE(HAVE_FRAMEWORK_CARBON, 1, [Define if framework CARBON is available.])
  CARBON_LIBS="-Wl,-framework -Wl,Carbon"
  AC_MSG_NOTICE([adding -Wl,-framework -Wl,Carbon to CARBON_LIBS])
  AC_SUBST(CARBON_LIBS)
fi

### When compiling math for x87, problems may arise in some code comparing
### floating-point intermediate results.
### Generally, it helps to store the result in a local volatile variable,
### but it also degrades performance.
### Thus, we provide a FLOAT_TRUNCATE macro that may be defined to "volatile"
### when compiling for x87 target, or left empty for modern SSE math, that
### doesn't suffer from this problem at all.
AC_ARG_ENABLE(float-truncate,
  [AS_HELP_STRING([--enable-float-truncate],
     [enables truncating intermediate FP results.])],
  [if test "$enableval" = yes; then ac_float_truncate=volatile;
   else ac_float_truncate=; fi],
  ac_float_truncate=)

AC_DEFINE_UNQUOTED(FLOAT_TRUNCATE, $ac_float_truncate, 
          [Define to volatile if you need truncating intermediate FP results])

### On Intel systems with gcc, we may need to compile with -mieee-fp
### and -ffloat-store to get full support for IEEE floating point.
###
### On Alpha/OSF systems, we need -mieee.

ieee_fp_flag=
case "$canonical_host_type" in
  ## Keep this pattern first, so that it is preferred over the
  ## following pattern for x86.
  i[[3456789]]86-*-*)
    if test "$GCC" = yes; then
      OCTAVE_CC_FLAG(-mieee-fp, [
        ieee_fp_flag=-mieee-fp
        XTRA_CFLAGS="$XTRA_CFLAGS -mieee-fp"
        AC_MSG_NOTICE([adding -mieee-fp to XTRA_CFLAGS])])

###      OCTAVE_CC_FLAG(-ffloat-store, [
###        float_store_flag=-ffloat-store
###        XTRA_CFLAGS="$XTRA_CFLAGS -ffloat-store"
###        AC_MSG_RESULT([adding -ffloat-store to XTRA_CFLAGS])])
    fi
    if test "$GXX" = yes; then
      OCTAVE_CXX_FLAG(-mieee-fp, [
        ieee_fp_flag=-mieee-fp
        XTRA_CXXFLAGS="$XTRA_CXXFLAGS -mieee-fp"
        AC_MSG_NOTICE([adding -mieee-fp to XTRA_CXXFLAGS])])

###      OCTAVE_CXX_FLAG(-ffloat-store, [
###        float_store_flag=-ffloat-store
###        XTRA_CXXFLAGS="$XTRA_CXXFLAGS -ffloat-store"
###        AC_MSG_RESULT([adding -ffloat-store to XTRA_CXXFLAGS])])
    fi
  ;;
  alpha*-*-*)
    if test "$GCC" = yes; then
      OCTAVE_CC_FLAG(-mieee, [
        ieee_fp_flag=-mieee
        XTRA_CFLAGS="$XTRA_CFLAGS -mieee"
        AC_MSG_NOTICE([adding -mieee to XTRA_CFLAGS])])
    else
      OCTAVE_CC_FLAG(-ieee, [
        ieee_fp_flag=-ieee
        XTRA_CFLAGS="$XTRA_CFLAGS -ieee"
        AC_MSG_NOTICE([adding -ieee to XTRA_CFLAGS])])
    fi
    if test "$GXX" = yes; then
      OCTAVE_CXX_FLAG(-mieee, [
        ieee_fp_flag=-mieee
        XTRA_CXXFLAGS="$XTRA_CXXFLAGS -mieee"
        AC_MSG_NOTICE([adding -mieee to XTRA_CXXFLAGS])])
    else
      OCTAVE_CXX_FLAG(-ieee, [
        ieee_fp_flag=-ieee
        XTRA_CXXFLAGS="$XTRA_CXXFLAGS -ieee"
        AC_MSG_NOTICE([adding -ieee to XTRA_CXXFLAGS])])
    fi
  ;;
  *ibm-aix4*)
    OCTAVE_CC_FLAG(-mminimal-toc, [
      XTRA_CFLAGS="$XTRA_CFLAGS -mminimal-toc"])

    OCTAVE_CXX_FLAG(-mminimal-toc, [
      XTRA_CXXFLAGS="$XTRA_CXXFLAGS -mminimal-toc"])
  ;;
esac

## Test whether the compiler supports OpenMP. Experimental so disable by 
## default. Enable it with the flag --enable-openmp
USE_OPENMP=false
AC_ARG_ENABLE(openmp,
  [AS_HELP_STRING([--enable-openmp],
     [(EXPERIMENTAL) use OpenMP SMP multi-threading])],
  [if test "$enableval" = yes; then USE_OPENMP=true; fi], [])
if $USE_OPENMP; then
  case "$canonical_host_type" in
    *-*-mingw* | *-*-cygwin* | *-*-gnu*)
    OCTAVE_CHECK_OPENMP(-fopenmp)
    ;;
    *-*-msdosmsvc)
    ## FIXME is this the right flag for MSVC?
    OCTAVE_CHECK_OPENMP(-openmp)
    ;;
    ## Add other compilers supporting OpenMP here
  esac
fi

AC_SUBST(XTRA_CFLAGS)
AC_SUBST(XTRA_CXXFLAGS)

## Avoid #define of min/max from windows.h header
if test "$have_msvc" = "yes"; then
  AC_DEFINE(NOMINMAX, 1, [Define if you want to avoid min/max macro definition in Windows headers])
fi

### Use -static if compiling on Alpha OSF/1 1.3 systems.

case "$canonical_host_type" in
  alpha*-dec-osf1.3)
    LD_STATIC_FLAG=-static
  ;;
esac
if test -n "$LD_STATIC_FLAG"; then
  AC_MSG_NOTICE([defining LD_STATIC_FLAG to be $LD_STATIC_FLAG])
fi
AC_SUBST(LD_STATIC_FLAG)

### Defaults for cross compiling.  BUILD_CC and BUILD_CXX are
### the compilers that we use for building tools on the build system.
### For now, we assume that the only cross compiling we can do is
### with gcc on a Unixy system, but the dedicated hacker can override these.

if test "$cross_compiling" = yes; then
  BUILD_CC="gcc"
  BUILD_CFLAGS="-O2 -g"
  BUILD_CXX="g++"
  BUILD_CXXFLAGS="-O2 -g"
  BUILD_LDFLAGS=""
  BUILD_EXEEXT=""
else
  BUILD_CC='$(CC)'
  BUILD_CFLAGS='$(CFLAGS)'
  BUILD_CXX='$(CXX)'
  BUILD_CXXFLAGS='$(CXXFLAGS)'
  BUILD_LDFLAGS='$(LDFLAGS)'
  case "$canonical_host_type" in
    sparc-sun-solaris2*)
      if test "$GCC" != yes; then
        ## The Sun C++ compiler never seems to complete compiling
        ## gendoc.cc unless we reduce the optimization level...
        BUILD_CXXFLAGS="-g -O1"
      fi
    ;;
  esac
  BUILD_EXEEXT='$(EXEEXT)'
fi

AC_ARG_VAR(BUILD_CC, [build system C compiler (used if cross compiling)])
AC_ARG_VAR(BUILD_CFLAGS, [build system C compiler flags (used if cross compiling)])
AC_ARG_VAR(BUILD_CXX, [build system C++ compiler (used if cross compiling)])
AC_ARG_VAR(BUILD_CXXFLAGS, [build system C++ compiler flags (used if cross compiling)])
AC_ARG_VAR(BUILD_LDFLAGS, [build system C++ compiler link flags (used if cross compiling)])
AC_ARG_VAR(BUILD_EXEEXT, [build system executable extension (used if cross compiling)])

dnl This is bogus.  We shouldn't have to explicitly add libc too!
dnl Keep this check before the check for the Fortran compiler,
dnl in case -lm is needed to compile Fortran programs.

### Look for math library.  If found, this will add -lm to LIBS.

case "$canonical_host_type" in
  *-*-linux*)
    AC_CHECK_LIB(m, sin, , , -lc)
  ;;
  *)
    AC_CHECK_LIB(m, sin)
  ;;
esac

## Default FFLAGS is -O.
if test "x$FFLAGS" = x; then
  FFLAGS="-O"
fi

## the F77 variable, if set, overrides AC_PROG_F77 automatically
AC_PROG_F77
AC_F77_LIBRARY_LDFLAGS
AC_F77_DUMMY_MAIN
AC_F77_WRAPPERS

F77_TOLOWER=true
F77_APPEND_UNDERSCORE=true
F77_APPEND_EXTRA_UNDERSCORE=true

case "$ac_cv_f77_mangling" in
  "upper case") F77_TOLOWER=false ;;
esac
case "$ac_cv_f77_mangling" in
  "no underscore") F77_APPEND_UNDERSCORE=false ;;
esac
case "$ac_cv_f77_mangling" in
  "no extra underscore") F77_APPEND_EXTRA_UNDERSCORE=false ;;
esac

case "$canonical_host_type" in
  i[[3456789]]86-*-*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      OCTAVE_F77_FLAG(-mieee-fp)
###      OCTAVE_F77_FLAG(-ffloat-store)
    fi
  ;;
  alpha*-*-*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      OCTAVE_F77_FLAG(-mieee)
    else
      OCTAVE_F77_FLAG(-ieee)
      OCTAVE_F77_FLAG(-fpe1)
    fi
  ;;
  powerpc-apple-machten*)
    FFLAGS=
  ;;
esac

if test -n "$FFLAGS"; then
  AC_MSG_NOTICE([defining FFLAGS to be $FFLAGS])
fi

AC_SUBST(F77_TOLOWER)
AC_SUBST(F77_APPEND_UNDERSCORE)
AC_SUBST(F77_APPEND_EXTRA_UNDERSCORE)

if test -z "$F77"; then
  AC_MSG_ERROR([in order to build octave, you must have a compatible Fortran compiler or wrapper script for f2c that functions as a Fortran compiler installed and in your path.  See the file INSTALL for more information.])
fi

OCTAVE_CHECK_FORTRAN_INTEGER_SIZE
if test "x$octave_cv_fortran_integer_size" = xno; then
  if $USE_64_BIT_IDX_T; then
    case "$F77" in
      *gfortran*)
        case "$F77_INTEGER_8_FLAG" in
          *-fdefault-integer-8*)
          ;;
          *)
            case "$FFLAGS" in
              *-fdefault-integer-8*)
                AC_MSG_NOTICE([setting -fdefault-integer-8 in F77_INTEGER_8_FLAG instead of FFLAGS])
                FFLAGS=`echo $FFLAGS | sed 's/-fdefault-integer-8//g'`
                F77_INTEGER_8_FLAG="-fdefault-integer-8"
              ;;
              *)
                AC_MSG_NOTICE([adding -fdefault-integer-8 to F77_INTEGER_8_FLAG])
                F77_INTEGER_8_FLAG="-fdefault-integer-8"
                ## Invalidate the cache and try again.
                $as_unset octave_cv_fortran_integer_size
              ;;
            esac
          ;;
        esac
      ;;
    esac
    if test -z "$octave_cv_fortran_integer_size"; then
      OCTAVE_CHECK_FORTRAN_INTEGER_SIZE
    fi
    if test "x$octave_cv_fortran_integer_size" = xno; then
      AC_MSG_ERROR([in order to build octave with 64-bit indexing support your Fortran compiler must have an option for setting the default integer size to 8 bytes.  See the file INSTALL for more information.])
    fi
  else
    AC_MSG_ERROR([your Fortran compiler must have an option to make integers the same size as octave_idx_type ($OCTAVE_IDX_TYPE).  See the file INSTALL for more information.])
  fi
fi
AC_SUBST(F77_INTEGER_8_FLAG)

FC=$F77
AC_SUBST(FC)

OCTAVE_F77_FLAG(-ffloat-store, [
AC_MSG_RESULT([setting F77_FLOAT_STORE_FLAG to -ffloat-store])
F77_FLOAT_STORE_FLAG=-ffloat-store
AC_SUBST(F77_FLOAT_STORE_FLAG)
])

OCTAVE_IEEE754_DATA_FORMAT

OCTAVE_CXX_COMPLEX_SETTERS
OCTAVE_CXX_COMPLEX_REFERENCE_ACCESSORS

### Check for the QHull library

OCTAVE_CHECK_LIBRARY(qhull, QHull,
  [Qhull library not found -- this will result in loss of functionality of some geometry functions.],
  [libqhull/libqhull.h qhull/libqhull.h libqhull.h qhull/qhull.h qhull.h], [qh_qhull], [], [],
  [warn_qhull=
   OCTAVE_CHECK_QHULL_VERSION
   OCTAVE_CHECK_QHULL_OK([TEXINFO_QHULL="@set HAVE_QHULL"
     AC_DEFINE(HAVE_QHULL, 1, [Define if QHull is available.])], [
     warn_qhull="Qhull library found, but seems not to work properly -- this will result in loss of functionality of some geometry functions.  Please try recompiling the library with -fno-strict-aliasing."])])

### Check for pcre regex library.

REGEX_LIBS=

pcre_fail_msg="to build Octave, you must have the PCRE library and header files installed"

AC_CHECK_HEADERS([pcre.h pcre/pcre.h])

AC_CACHE_CHECK([whether pcre.h defines the macros we need],
  [ac_cv_pcre_h_macros_present],
  [AC_EGREP_CPP([PCRE_HAS_MACROS_WE_NEED], [
#if defined (HAVE_PCRE_H)
#include <pcre.h>
#elif defined (HAVE_PCRE_PCRE_H)
#include <pcre.h>
#error "NO PCRE HEADER"
#endif
#if defined (PCRE_INFO_NAMECOUNT) \
  && defined (PCRE_INFO_NAMEENTRYSIZE) \
  && defined (PCRE_INFO_NAMETABLE)
PCRE_HAS_MACROS_WE_NEED
#endif], ac_cv_pcre_h_macros_present=yes, ac_cv_pcre_h_macros_present=no)])

if test $ac_cv_pcre_h_macros_present = yes; then
  ## check for pcre-config, and if so, set XTRA_CXXFLAGS appropriately
  AC_CHECK_PROG(HAVE_PCRE_CONFIG, pcre-config, [yes], [no])
  if test $HAVE_PCRE_CONFIG = yes; then
    XTRA_CXXFLAGS="$XTRA_CXXFLAGS `pcre-config --cflags`"
    REGEX_LIBS="`pcre-config --libs`"
  else
    REGEX_LIBS="-lpcre"
  fi
  save_LIBS="$LIBS"
  LIBS="$REGEX_LIBS $LIBS"
  AC_CHECK_FUNCS(pcre_compile,
    [AC_SUBST(REGEX_LIBS)],
    [AC_MSG_ERROR([$pcre_fail_msg])])
  LIBS="$save_LIBS"
else
  AC_MSG_ERROR([$pcre_fail_msg])
fi

### Check for ZLIB library.

OCTAVE_CHECK_LIBRARY(z, ZLIB,
  [ZLIB library not found.  Octave will not be able to save or load compressed data files or HDF5 files.],
  [zlib.h], [gzclearerr])

### Check for HDF5 library.

save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$Z_CPPFLAGS $CPPFLAGS"
save_LIBS="$LIBS"
LIBS="$Z_LDFLAGS $Z_LIBS $LIBS"
OCTAVE_CHECK_LIBRARY(hdf5, HDF5,
  [HDF5 library not found.  Octave will not be able to save or load HDF5 data files.],
  [hdf5.h], [H5Gget_num_objs], [], [],
  [warn_hdf5=
   OCTAVE_HDF5_HAS_ENFORCED_16_API
   TEXINFO_HDF5="@set HAVE_HDF5"
   AC_DEFINE(HAVE_HDF5, 1, [Define if HDF5 is available and newer than version 1.6.])
   if test "$have_msvc" = "yes"; then
     OCTAVE_HDF5_DLL
   fi
   ])
CPPFLAGS="$save_CPPFLAGS"
LIBS="$save_LIBS"


# Subdirectory of libcruft to build if fftw is not found:

FFT_DIR="fftpack"
AC_SUBST(FFT_DIR)

# Checks for FFTW header and library.

OCTAVE_CHECK_LIBRARY(fftw3, FFTW3,
  [FFTW3 library not found.  The slower FFTPACK library will be used instead.],
  [fftw3.h], [fftw_plan_dft_1d])

OCTAVE_CHECK_LIBRARY(fftw3f, FFTW3F,
  [FFTW3F library not found.  The slower FFTPACK library will be used instead.],
  [fftw3.h], [fftwf_plan_dft_1d])

AM_CONDITIONAL([AMCOND_HAVE_FFTW],
  [test -n "$FFTW3_LIBS" && test -n "$FFTW3F_LIBS"])

# Checks for GLPK header and library.

save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$Z_CPPFLAGS $CPPFLAGS"
save_LIBS="$LIBS"
LIBS="$Z_LDFLAGS $Z_LIBS $LIBS"
OCTAVE_CHECK_LIBRARY(glpk, GLPK,
  [GLPK library not found.  The glpk function for solving linear programs will be disabled.],
  [glpk/glpk.h glpk.h], [_glp_lpx_simplex])
LIBS="$save_LIBS"
CPPFLAGS="$save_CPPFLAGS"

# Checks for CURL header and library.

save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$Z_CPPFLAGS $CPPFLAGS"
save_LIBS="$LIBS"
LIBS="$Z_LDFLAGS $Z_LIBS $LIBS"
OCTAVE_CHECK_LIBRARY(curl, cURL,
  [cURL library not found.  The ftp objects, urlread and urlwrite functions will be disabled.],
  [curl/curl.h], [curl_easy_escape])
LIBS="$save_LIBS"
CPPFLAGS="$save_CPPFLAGS"

### Graphics/ImageMagick++

AC_ARG_WITH([magick],
  [AS_HELP_STRING([--with-magick=LIB],
    [select library to use for image I/O (options: GraphicsMagick(default) or ImageMagick)])], [
  magick="$withval"], [
  magick="GraphicsMagick"])

warn_magick="$magick++ library not found.  The imread function for reading image files will not be fully functional."

MAGICK_CPPFLAGS=
MAGICK_LDFLAGS=
MAGICK_LIBS=

PKG_CHECK_EXISTS([$magick++], [
  ## Make sure we only get -I, -L and -l flags.  Some Graphics/ImageMagick++
  ## packages adds extra flags that are useful when building
  ## Graphics/ImageMagick++ extentions.  These extra flags break the
  ## Octave build. 
  MAGICK_LDFLAGS=`$PKG_CONFIG --libs-only-L $magick++`
  MAGICK_LIBS=`$PKG_CONFIG --libs-only-l $magick++`
  MAGICK_CPPFLAGS=`$PKG_CONFIG --cflags-only-I $magick++`

  warn_magick="$magick++ library fails tests.  The imread function for reading image files will not be fully functional."

  save_CPPFLAGS="$CPPFLAGS"
  save_LIBS="$LIBS"
  CPPFLAGS="$MAGICK_CPPFLAGS $CPPFLAGS"
  LIBS="$MAGICK_LDFLAGS $MAGICK_LIBS $LIBS"
  AC_LANG_PUSH(C++)
    AC_CHECK_HEADER([Magick++.h], [
      AC_MSG_CHECKING([for Magick::ColorRGB in Magick++.h])
      AC_TRY_LINK([#include <Magick++.h>], [Magick::ColorRGB c;], [
        AC_MSG_RESULT(yes)
        warn_magick=
      ], [
        AC_MSG_RESULT(no)
      ])
    ])
  AC_LANG_POP(C++)
  CPPFLAGS="$save_CPPFLAGS"
  LIBS="$save_LIBS"
])

if test -z "$warn_magick"; then
  AC_DEFINE(HAVE_MAGICK, 1, [Define if Graphics/ImageMagick++ is available.])
else
  MAGICK_CPPFLAGS=
  MAGICK_LDFLAGS=
  MAGICK_LIBS=
fi
AC_SUBST(MAGICK_CPPFLAGS)
AC_SUBST(MAGICK_LDFLAGS)
AC_SUBST(MAGICK_LIBS)

# ---------------------------------------------------------------------

## libraries needed for native graphics renderer

warn_freetype=""

check_opengl=false
AC_ARG_WITH([opengl],
  [AS_HELP_STRING([--without-opengl], [don't use OpenGL libraries, disable native graphics])],
  [if test "x$withval" = xno; then
     warn_opengl="--without-opengl specified.  Native graphics will be disabled."
     AC_MSG_WARN([$warn_opengl])
   else
     check_opengl=true
   fi],
  [check_opengl=true])

if $check_opengl; then
  OCTAVE_OPENGL
fi

GRAPHICS_LIBS=
GRAPHICS_CFLAGS=

if test -z "$OPENGL_LIBS"; then
  if $check_opengl; then
    warn_fltk_opengl="OpenGL libs (GL and GLU) not found. Native graphics will be disabled."
  fi
fi

if test -n "$OPENGL_LIBS"; then
  AC_DEFINE(HAVE_OPENGL, 1, [Define if OpenGL is available])

  ## freetype 2

  AC_CHECK_FT2([9.0.3], [AC_DEFINE(HAVE_FREETYPE, 1, [Define to 1 if you have Freetype library.])
    XTRA_CXXFLAGS="$XTRA_CXXFLAGS $FT2_CFLAGS"],
    [warn_freetype="FreeType library not found.  Native graphics will be disabled."])

  ## fontconfig library

  warn_fontconfig=""
  if test -z "$warn_freetype"; then
    PKG_CHECK_MODULES(FONTCONFIG, [fontconfig], [
      have_fontconfig=yes
      OPENGL_LIBS="$FONTCONFIG_LIBS $OPENGL_LIBS"
      XTRA_CXXFLAGS="$XTRA_CXXFLAGS $FONTCONFIG_CFLAGS"
      AC_DEFINE(HAVE_FONTCONFIG, 1, [Define to 1 if fontconfig is present])], [
      have_fontconfig=no
      warn_fontconfig="Fontconfig library not found.  Native graphics will be disabled."])
  fi

  ## fltk (www.fltk.org)

  AC_ARG_WITH([fltk-prefix], [
    AS_HELP_STRING([--with-fltk-prefix=PFX],
      [Prefix where FLTK is installed (optional)])], [
    fltk_prefix="$withval"], [
    fltk_prefix=""])

  AC_ARG_WITH([fltk-exec-prefix], [
    AS_HELP_STRING([--with-fltk-exec-prefix=PFX],
      [Exec prefix where FLTK is installed (optional)])], [
    fltk_exec_prefix="$withval"], [
    fltk_exec_prefix=""])

  if test -n "$fltk_exec_prefix"; then
    fltk_args="$fltk_args --exec-prefix=$fltk_exec_prefix"
    if test "x${FLTK_CONFIG+set}" != xset ; then
      FLTK_CONFIG="$fltk_exec_prefix/bin/fltk-config"
    fi
  fi

  if test -n "$fltk_prefix"; then
    fltk_args="$fltk_args --prefix=$fltk_prefix"
    if test x${FLTK_CONFIG+set} != xset ; then
      FLTK_CONFIG="$fltk_prefix/bin/fltk-config"
    fi
  fi

  AC_PATH_PROG([FLTK_CONFIG], [fltk-config], [no])

  warn_fltk_config=""
  warn_fltk_opengl=""

  if test "$FLTK_CONFIG" = "no" ; then
    warn_fltk_config="FLTK config script not found.  Native graphics will be disabled."
  else
    FLTK_CFLAGS="`$FLTK_CONFIG $fltkconf_args --use-gl --cflags`"
    FLTK_LDFLAGS="`$FLTK_CONFIG $fltkconf_args --use-gl --ldflags`"

    case "$canonical_host_type" in
      *-*-mingw*)
        FLTK_LDFLAGS="`echo $FLTK_LDFLAGS | sed -e 's/-mwindows//g'`"
      ;;
    esac

    AC_MSG_CHECKING([for OpenGL support in FLTK])
    save_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS $FLTK_CFLAGS"
    AC_COMPILE_IFELSE(
      [AC_LANG_PROGRAM([[#include <FL/gl.h>]], [[int nothing = 0;]])],
        [
         AC_MSG_RESULT([no])
         warn_fltk_opengl="FLTK does not have OpenGL support.  Native graphics will be disabled."
        ],[
         AC_DEFINE(HAVE_FLTK, 1, [Define if FLTK is available])
         AC_MSG_RESULT([yes])
        ])
         
    if test -z "$warn_fltk_opengl"; then
      GRAPHICS_CFLAGS="$FLTK_CFLAGS"
      GRAPHICS_LIBS="$FLTK_LDFLAGS"
    fi
    CFLAGS="$save_CFLAGS"
  fi
fi

AC_SUBST(GRAPHICS_CFLAGS)
AC_SUBST(GRAPHICS_LIBS)

# ----------------------------------------------------------------------

OCTAVE_PROG_AR

ifdef([LT_INIT], [], [
  errprint([error: you must have libtool 2.2.2 or a more recent version
])
  m4exit([1])])

LT_PREREQ([2.2.2])
LT_INIT([disable-static dlopen win32-dll])

if test x$enable_shared = xyes; then
  SHARED_LIBS=true
else
  SHARED_LIBS=false
fi

if test x$enable_static = xyes; then
  STATIC_LIBS=true
else
  STATIC_LIBS=false
fi

XTRA_CRUFT_SH_LDFLAGS=
if test "$have_msvc" = "yes"; then
  FLIBS="$FLIBS -lkernel32"
  XTRA_CRUFT_SH_LDFLAGS="-Wl,-def:cruft.def"
fi
AC_SUBST(XTRA_CRUFT_SH_LDFLAGS)

### Checks for BLAS and LAPACK libraries:

## Need to adjust FFLAGS to include correct integer size.
save_FFLAGS="$FFLAGS"
FFLAGS="$FFLAGS $F77_INTEGER_8_FLAG"

AX_BLAS_WITH_F77_FUNC([:], [:])
AX_LAPACK([:], [:])

## Restore FFLAGS.
FFLAGS="$save_FFLAGS"

## Try again with -ff2c in FFLAGS
if test "x$ax_blas_f77_func_ok" = "xno"; then
  save_FFLAGS="$FFLAGS"
  FFLAGS="-ff2c $FFLAGS $F77_INTEGER_8_FLAG"

  AX_BLAS_WITH_F77_FUNC([:], [:])
  AX_LAPACK([:], [:])

  ## Restore FFLAGS, with -ff2c if that was helpful

  if test "x$ax_blas_f77_func_ok" = "xno"; then
    FFLAGS="$save_FFLAGS"
  else
    FFLAGS="-ff2c $save_FFLAGS"
  fi
fi

## On OSX, try again with a wrapper library (without -ff2c!)
if test "x$ax_blas_f77_func_ok" = "xno"; then
  case "$canonical_host_type" in
    *-*-darwin*)
      ## test if wrapper functions help
      octave_blaswrap_save_CFLAGS="$CFLAGS"
      CFLAGS="$CFLAGS -DUSE_BLASWRAP"
      AC_LANG_PUSH(C)
      AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include "libcruft/misc/blaswrap.c"
])],
       [mv conftest.$ac_objext blaswrap.$ac_objext
        octave_blaswrap_save_BLAS_LIBS="$BLAS_LIBS"
        BLAS_LIBS="blaswrap.$ac_objext -framework vecLib"

        save_FFLAGS="$FFLAGS"
        FFLAGS="$FFLAGS $F77_INTEGER_8_FLAG"

        AX_BLAS_WITH_F77_FUNC([:], [:])
        AX_LAPACK([:], [:])

        ## Restore FFLAGS.
        FFLAGS="$save_FFLAGS"

        ## remove temp file
        rm -f blaswrap.$ac_objext],
       [AC_MSG_FAILURE([cannot compile libcruft/misc/blaswrap.c])])
      AC_LANG_POP(C)
      CFLAGS="$octave_blaswrap_save_CFLAGS"

      if test "x$ax_blas_f77_func_ok" = "xno"; then
        BLAS_LIBS="$octave_blaswrap_save_BLAS_LIBS"
      else
        ## wrapper in libcruft, remove from BLAS_LIBS
        BLAS_LIBS="`echo $BLAS_LIBS | sed -e 's/blaswrap.[[^ ]]* //g'`"
        AC_DEFINE(USE_BLASWRAP, [1], [Define this if BLAS functions need to be wrapped (potentially needed for 64-bit OSX only).])
      fi
    ;;
  esac
fi

if test "x$ax_blas_f77_func_ok" = "xno"; then
  if $USE_64_BIT_IDX_T && test "$ax_blas_integer_size_ok" = "no" ; then
    ## Attempt to be more informative.
    AC_MSG_ERROR([BLAS doesn't seem to support 64-bit integers. This is incompatible with --enable-64.])
  else
    AC_MSG_ERROR([A BLAS library was detected but found incompatible with your Fortran 77 compiler settings.])
  fi
fi

if test x$ax_blas_ok = xno || test x$ax_lapack_ok = xno; then
  AC_MSG_ERROR([You are required to have BLAS and LAPACK libraries])
fi

### Check for the qrupdate library
## No need to adjust FFLAGS because only link is attempted. 
## Must supply proper LIBS, however.

save_LIBS="$LIBS"
LIBS="$LAPACK_LIBS $BLAS_LIBS $FLIBS $LIBS"
OCTAVE_CHECK_LIBRARY(qrupdate, qrupdate,
  [qrupdate not found.  The QR & Cholesky updating functions will be slow.],
  [],
  [sqr1up],
  [Fortran 77], [don't use qrupdate, disable QR & Cholesky updating functions])

if test "$octave_qrupdate_ok" = yes; then
  LIBS="$LIBS $QRUPDATE_LIBS"
  AC_LANG_PUSH([Fortran 77])
  AC_MSG_CHECKING([for slup1up in $QRUPDATE_LIBS])
  octave_qrupdate_luu=no
  AC_LINK_IFELSE([AC_LANG_CALL([], [slup1up])],
  [octave_qrupdate_luu=yes])
  AC_MSG_RESULT([$octave_qrupdate_luu])
  if test "$octave_qrupdate_luu" = yes; then
    AC_DEFINE(HAVE_QRUPDATE_LUU, [1], [Define if qrupdate supports LU updates])
  fi
  AC_LANG_POP([Fortran 77])
fi
LIBS="$save_LIBS"

# Check for AMD library

OCTAVE_CHECK_LIBRARY(amd, AMD,
  [AMD library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/amd.h ufsparse/amd.h amd/amd.h amd.h],
  [amd_postorder],
  [], [don't use AMD library, disable some sparse matrix functionality])

# Check for CAMD library

OCTAVE_CHECK_LIBRARY(camd, CAMD,
  [CAMD library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/camd.h ufsparse/camd.h amd/camd.h camd.h],
  [camd_postorder],
  [], [don't use CAMD library, disable some sparse matrix functionality])

# Check for COLAMD library

OCTAVE_CHECK_LIBRARY(colamd, COLAMD,
  [COLAMD library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/colamd.h ufsparse/colamd.h amd/colamd.h colamd.h],
  [colamd],
  [], [don't use COLAMD library, disable some sparse matrix functionality])

# Check for CCOLAMD library

OCTAVE_CHECK_LIBRARY(ccolamd, CCOLAMD,
  [CCOLAMD library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/ccolamd.h ufsparse/ccolamd.h amd/ccolamd.h ccolamd.h],
  [ccolamd],
  [], [don't use CCOLAMD library, disable some sparse matrix functionality])

# Check for CHOLMOD library.  If your cholmod library requires cblas,
# then you will need to configure with --with-cholmod="-lcholmod -lcblas".

save_LIBS="$LIBS"
LIBS="$COLAMD_LDFLAGS $COLAMD_LIBS $AMD_LDFLAGS $AMD_LIBS $LAPACK_LIBS $BLAS_LIBS $FLIBS $LIBS"
OCTAVE_CHECK_LIBRARY(cholmod, CHOLMOD,
  [CHOLMOD library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/cholmod.h ufsparse/cholmod.h cholmod/cholmod.h cholmod.h],
  [cholmod_start],
  [], [don't use CHOLMOD library, disable some sparse matrix functionality])
LIBS="$save_LIBS"

# Check for CXSparse library

OCTAVE_CHECK_LIBRARY(cxsparse, CXSparse,
  [CXSparse library not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/cs.h ufsparse/cs.h amd/cs.h cs.h],
  [cs_di_sqr],
  [C++], [don't use CXSparse library, disable some sparse matrix functionality])

# Check for UMFPACK library.

save_LIBS="$LIBS"
save_CPPFLAGS="$CPPFLAGS"
LIBS="$AMD_LDFLAGS $AMD_LIBS $BLAS_LIBS $FLIBS $LIBS"
CPPFLAGS="$AMD_CPPFLAGS $CPPFLAGS"
OCTAVE_CHECK_LIBRARY(umfpack, UMFPACK,
  [UMFPACK not found.  This will result in some lack of functionality for sparse matrices.],
  [suitesparse/umfpack.h ufsparse/umfpack.h umfpack/umfpack.h umfpack.h],
  [umfpack_zi_get_determinant],
  [], [don't use UMFPACK, disable some sparse matrix functionality])
CPPFLAGS="$save_CPPFLAGS"
LIBS="$save_LIBS"

if test -z "$UMFPACK_LIBS"; then
  ## Invalidate the cache and try again with -lcblas.
  $as_unset ac_cv_lib_umfpack_umfpack_zi_get_determinant
  save_LIBS="$LIBS"
  LIBS="-lcblas $AMD_LDFLAGS $AMD_LIBS $BLAS_LIBS $FLIBS $LIBS"
  OCTAVE_CHECK_LIBRARY(umfpack, UMFPACK,
    [UMFPACK not found.  This will result in some lack of functionality for sparse matrices.],
    [suitesparse/umfpack.h ufsparse/umfpack.h umfpack/umfpack.h umfpack.h],
    [umfpack_zi_get_determinant],
    [], [don't use UMFPACK, disable some sparse matrix functionality])
  if test -n "$UMFPACK_LIBS"; then
    UMFPACK_LIBS="$UMFPACK_LIBS -lcblas"
  fi
  LIBS="$save_LIBS"
fi

if test -n "$UMFPACK_LIBS"; then
  save_LIBS="$LIBS";
  LIBS="$UMFPACK_LIBS $AMD_LIBS $BLAS_LIBS $FLIBS $LIBS"
  OCTAVE_UMFPACK_SEPERATE_SPLIT
  LIBS="$save_LIBS"
fi

save_LIBS="$LIBS"
LIBS="$LAPACK_LIBS $BLAS_LIBS $FLIBS $LIBS"
OCTAVE_CHECK_LIBRARY(arpack, ARPACK,
  [ARPACK not found.  The eigs function will be disabled.],
  [],
  [dseupd],
  [Fortran 77], [don't use the ARPACK library, disable eigs function],
  [warn_arpack=
   OCTAVE_CHECK_ARPACK_OK([
     AC_DEFINE(HAVE_ARPACK, 1, [Define if ARPACK is available.])], [
     warn_arpack="ARPACK library found, but seems not to work properly -- disabling eigs function"])])
LIBS="$save_LIBS"

### Enable dynamic linking.  --enable-shared implies this, so
### --enable-dl is only need if you are only building static libraries
### and want to try dynamic linking too (works on some systems, for
### example, OS X and Windows).

AC_ARG_ENABLE([dl],
  [AS_HELP_STRING([--enable-dl],
    [allow loading of dynamically linked modules (not all systems)])], [
  case "${enableval}" in
    yes) ENABLE_DYNAMIC_LINKING=true ;;
    no) ENABLE_DYNAMIC_LINKING=false ;;
    *) AC_MSG_ERROR([bad value ${enableval} for --enable-dl]) ;;
  esac], [ENABLE_DYNAMIC_LINKING=true])

if $STATIC_LIBS || $SHARED_LIBS; then
  true
else
  AC_MSG_ERROR([You can't disable building static AND shared libraries!])
fi

CPICFLAG=-fPIC
CXXPICFLAG=-fPIC
FPICFLAG=-fPIC
SHLEXT=so
SHLLIB='$(SHLEXT)'
SHLBIN=
SHLEXT_VER='$(SHLEXT).$(version)'
SHLLIB_VER='$(SHLLIB).$(version)'
SHLBIN_VER='$(SHLBIN).$(version)'
SHLLINKEXT=
LIBPRE=lib
SHLPRE=lib
SHLLIBPRE=lib
SHLBINPRE=lib
SH_LD='$(CXX)'
SH_LDFLAGS=-shared
DL_LD='$(SH_LD)'
DL_LDFLAGS='$(SH_LDFLAGS)'
MKOCTFILE_DL_LDFLAGS='$(DL_LDFLAGS)'
SONAME_FLAGS=
NO_OCT_FILE_STRIP=false
TEMPLATE_AR='$(AR)'
TEMPLATE_ARFLAGS="$ARFLAGS"
CRUFT_DLL_DEFS=
OCTAVE_DLL_DEFS=
OCTINTERP_DLL_DEFS=
OCTGRAPHICS_DLL_DEFS=
library_path_var=LD_LIBRARY_PATH
ldpreloadsep=" "
BUILD_COMPILED_AUX_PROGRAMS=false
case "$canonical_host_type" in
  *-*-386bsd* | *-*-netbsd*)
    SH_LD=ld
    SH_LDFLAGS=-Bshareable
  ;;
  *-*-openbsd*)
    SH_LDFLAGS='-shared -fPIC'
  ;;
  *-*-freebsd*)
    SH_LDFLAGS="-shared -Wl,-x"
  ;;
  alpha*-dec-osf*)
    CPICFLAG=
    CXXPICFLAG=
    FPICFLAG=
    SH_LDFLAGS="-shared -Wl,-expect_unresolved -Wl,'*'"
  ;;
  *-*-darwin*)
    DL_LDFLAGS='-bundle -bundle_loader $(top_builddir)/src/octave $(LDFLAGS)'
    MKOCTFILE_DL_LDFLAGS='-bundle -bundle_loader $$BINDIR/octave-$$OCTAVE_VERSION$$EXEEXT'
    SH_LDFLAGS='-dynamiclib -single_module $(LDFLAGS)'
    case "$canonical_host_type" in
      powerpc-*)
        CXXPICFLAG=
        CPICFLAG=
        FPICFLAG=
      ;;
    esac
    SHLEXT=dylib 
    SHLLIB='$(SHLEXT)'
    SHLEXT_VER='$(version).$(SHLEXT)'
    SHLLIB_VER='$(version).$(SHLLIB)'
    NO_OCT_FILE_STRIP=true
    SONAME_FLAGS='-install_name $(octlibdir)/$@'
    library_path_var=DYLD_LIBRARY_PATH  
  ;;
  *-*-cygwin*)
    CPICFLAG=
    CXXPICFLAG=
    FPICFLAG=
    LIBPRE=lib
    SHLPRE=cyg
    SHLBINPRE=cyg
    SHLEXT=dll
    SHLLIB=dll.a
    SHLBIN=dll    
    DL_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--enable-runtime-pseudo-reloc"
    SH_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--enable-auto-image-base"
    SONAME_FLAGS='-Wl,--out-implib=$(patsubst $(SHLPRE)%,$(LIBPRE)%,$@).a'
    ldpreloadsep=":"
  ;;
  *-*-mingw*)
    BUILD_COMPILED_AUX_PROGRAMS=true
    if test "$have_msvc" = "yes"; then
      DL_LDFLAGS="-shared"
      CPICFLAG=
      CXXPICFLAG=
      FPICFLAG=
      SHLEXT=dll
      SHLLIB=lib
      SHLBIN=dll
      LIBPRE=
      SHLPRE=
      SHLLIBPRE=
      SHLBINPRE=
      SH_LDFLAGS="-shared"
      if test -n "`echo $CFLAGS | grep -e '-g'`" -o -n "`echo $CXXFLAGS | grep -e '-g'`"; then
        DL_LDFLAGS="$DL_LDFLAGS -g"
        SH_LDFLAGS="$SH_LDFLAGS -g"
      fi
      NO_OCT_FILE_STRIP=true
      library_path_var=PATH
      NO_OCT_FILE_STRIP=true
      ## Extra compilation flags.
      CRUFT_DLL_DEFS="-DCRUFT_DLL"
      OCTAVE_DLL_DEFS="-DOCTAVE_DLL"
      OCTINTERP_DLL_DEFS="-DOCTINTERP_DLL"
      OCTGRAPHICS_DLL_DEFS="-DOCTGRAPHICS_DLL"
    else
      CPICFLAG=
      CXXPICFLAG=
      FPICFLAG=
      SHLEXT=dll
      SHLLIB=dll.a
      SHLBIN=dll
      DL_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--enable-runtime-pseudo-reloc"
      SH_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import -Wl,--enable-auto-image-base"
      SONAME_FLAGS='-Wl,--out-implib=$@.a'
      library_path_var=PATH
    fi
  ;;

  *-*-msdosmsvc)
    BUILD_COMPILED_AUX_PROGRAMS=true
    DL_LDFLAGS="-shared"
    CPICFLAG=
    CXXPICFLAG=
    FPICFLAG=
    SHLEXT=dll
    SHLLIB=lib
    SHLBIN=dll
    LIBPRE=
    SHLPRE=
    SHLLIBPRE=
    SHLBINPRE=
    SH_LDFLAGS="-shared"
    if test -n "`echo $CFLAGS | grep -e '-g'`" -o -n "`echo $CXXFLAGS | grep -e '-g'`"; then
      DL_LDFLAGS="$DL_LDFLAGS -g"
      SH_LDFLAGS="$SH_LDFLAGS -g"
    fi
    NO_OCT_FILE_STRIP=true
    library_path_var=PATH
    NO_OCT_FILE_STRIP=true
    ## Extra compilation flags.
    CRUFT_DLL_DEFS="-DCRUFT_DLL"
    OCTAVE_DLL_DEFS="-DOCTAVE_DLL"
    OCTINTERP_DLL_DEFS="-DOCTINTERP_DLL"
    OCTGRAPHICS_DLL_DEFS="-DOCTGRAPHICS_DLL"
  ;;
  *-*-linux* | *-*-gnu*)
    MKOCTFILE_DL_LDFLAGS="-shared -Wl,-Bsymbolic"
    SONAME_FLAGS='-Wl,-soname -Wl,$@'
  ;;
  i[[3456]]86-*-sco3.2v5*)
    SONAME_FLAGS='-Wl,-h -Wl,$@'
    SH_LDFLAGS=-G
  ;;
  rs6000-ibm-aix* | powerpc-ibm-aix*)
    CPICFLAG=
    CXXPICFLAG=
    FPICFLAG=
    library_path_var=LIBPATH
  ;;
  hppa*-hp-hpux*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      FPICFLAG=-fPIC
    else
      FPICFLAG=+Z
    fi
    SHLEXT=sl
    SH_LDFLAGS="-shared -fPIC"
    library_path_var=SHLIB_PATH
  ;;
  ia64*-hp-hpux*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      FPICFLAG=-fPIC
    else
      FPICFLAG=+Z
    fi
    SH_LDFLAGS="-shared -fPIC"
  ;;
  *-sgi-*)
    CPICFLAG=
    CXXPICFLAG=
    FPICFLAG=
  ;;
  sparc-sun-sunos4*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      FPICFLAG=-fPIC
    else
      FPICFLAG=-PIC
    fi
    SH_LD=ld
    SH_LDFLAGS="-assert nodefinitions"
  ;;
  sparc-sun-solaris2* | i386-pc-solaris2*)
    if test "$ac_cv_f77_compiler_gnu" = yes; then
      FPICFLAG=-fPIC
    else
      FPICFLAG=-KPIC
    fi
    if test "$GCC" = yes; then
      CPICFLAG=-fPIC
    else
      CPICFLAG=-KPIC
    fi
    if test "$GXX" = yes; then
      CXXPICFLAG=-fPIC
      SH_LDFLAGS=-shared
    else
      CXXPICFLAG=-KPIC
      SH_LDFLAGS=-G
    fi
    ## Template closures in archive libraries need a different mechanism.
    if test "$GXX" = yes; then
      true
    else
      TEMPLATE_AR='$(CXX)'
      TEMPLATE_ARFLAGS="-xar -o"
    fi
  ;;
esac

AM_CONDITIONAL([AMCOND_BUILD_COMPILED_AUX_PROGRAMS],
  [test x$BUILD_COMPILED_AUX_PROGRAMS = xtrue])

AC_MSG_NOTICE([defining FPICFLAG to be $FPICFLAG])
AC_MSG_NOTICE([defining CPICFLAG to be $CPICFLAG])
AC_MSG_NOTICE([defining CXXPICFLAG to be $CXXPICFLAG])
AC_MSG_NOTICE([defining SHLEXT to be $SHLEXT])
AC_MSG_NOTICE([defining SHLLIB to be $SHLLIB])
AC_MSG_NOTICE([defining SHLBIN to be $SHLBIN])
AC_MSG_NOTICE([defining SHLEXT_VER to be $SHLEXT_VER])
AC_MSG_NOTICE([defining SHLLIB_VER to be $SHLLIB_VER])
AC_MSG_NOTICE([defining SHLBIN_VER to be $SHLBIN_VER])
AC_MSG_NOTICE([defining SHLLINKEXT to be $SHLLINKEXT])
AC_MSG_NOTICE([defining LIBPRE to be $LIBPRE])
AC_MSG_NOTICE([defining SHLPRE to be $SHLPRE])
AC_MSG_NOTICE([defining SHLLIBPRE to be $SHLLIBPRE])
AC_MSG_NOTICE([defining SHLBINPRE to be $SHLBINPRE])
AC_MSG_NOTICE([defining SH_LD to be $SH_LD])
AC_MSG_NOTICE([defining SH_LDFLAGS to be $SH_LDFLAGS])
AC_MSG_NOTICE([defining DL_LD to be $DL_LD])
AC_MSG_NOTICE([defining DL_LDFLAGS to be $DL_LDFLAGS])
AC_MSG_NOTICE([defining MKOCTFILE_DL_LDFLAGS to be $MKOCTFILE_DL_LDFLAGS])
AC_MSG_NOTICE([defining SONAME_FLAGS to be $SONAME_FLAGS])
AC_MSG_NOTICE([defining NO_OCT_FILE_STRIP to be $NO_OCT_FILE_STRIP])
AC_MSG_NOTICE([defining TEMPLATE_AR to be $TEMPLATE_AR])
AC_MSG_NOTICE([defining TEMPLATE_ARFLAGS to be $TEMPLATE_ARFLAGS])
AC_MSG_NOTICE([defining CRUFT_DLL_DEFS to be $CRUFT_DLL_DEFS])
AC_MSG_NOTICE([defining OCTAVE_DLL_DEFS to be $OCTAVE_DLL_DEFS])
AC_MSG_NOTICE([defining OCTINTERP_DLL_DEFS to be $OCTINTERP_DLL_DEFS])
AC_MSG_NOTICE([defining OCTGRAPHICS_DLL_DEFS to be $OCTGRAPHICS_DLL_DEFS])
AC_MSG_NOTICE([defining library_path_var to be $library_path_var])
AC_SUBST(FPICFLAG)
AC_SUBST(CPICFLAG)
AC_SUBST(CXXPICFLAG)
AC_SUBST(SHLEXT)
AC_SUBST(SHLLIB)
AC_SUBST(SHLBIN)
AC_SUBST(SHLEXT_VER)
AC_SUBST(SHLLIB_VER)
AC_SUBST(SHLBIN_VER)
AC_SUBST(SHLLINKEXT)
AC_SUBST(LIBPRE)
AC_SUBST(SHLPRE)
AC_SUBST(SHLLIBPRE)
AC_SUBST(SHLBINPRE)
AC_SUBST(SH_LD)
AC_SUBST(SH_LDFLAGS)
AC_SUBST(DL_LD)
AC_SUBST(DL_LDFLAGS)
AC_SUBST(MKOCTFILE_DL_LDFLAGS)
AC_SUBST(SONAME_FLAGS)
AC_SUBST(NO_OCT_FILE_STRIP)
AC_SUBST(TEMPLATE_AR)
AC_SUBST(TEMPLATE_ARFLAGS)
AC_SUBST(CRUFT_DLL_DEFS)
AC_SUBST(OCTAVE_DLL_DEFS)
AC_SUBST(OCTINTERP_DLL_DEFS)
AC_SUBST(OCTGRAPHICS_DLL_DEFS)
AC_SUBST(library_path_var)
AC_SUBST(ldpreloadsep)

### special checks for odd OS specific things.

AC_CHECK_FUNCS(getpwnam, [], [AC_CHECK_LIB(sun, getpwnam)])

case "$canonical_host_type" in
  *-*-mingw*)
    if test "$have_msvc" = "yes"; then
      AC_CHECK_LIB(dirent, opendir)
      LIBS="$LIBS -ladvapi32 -lgdi32 -lws2_32 -luser32 -lkernel32"
    else
      LIBS="$LIBS -lgdi32 -lws2_32 -luser32 -lkernel32"
    fi
    LIBS="$LIBS -lgdi32 -lws2_32 -luser32 -lkernel32"
  ;;
  *-*-msdosmsvc*)
    AC_CHECK_LIB(dirent, opendir)
    LIBS="$LIBS -ladvapi32 -lgdi32 -lws2_32 -luser32 -lkernel32"
  ;;
esac

AC_ARG_ENABLE([no-undefined],
  [AS_HELP_STRING([--enable-no-undefined],
    [pass -no-undefined to libtool when linking Octave and its shared libraries (on by default)])],
  [case "${enableval}" in
    yes) NO_UNDEFINED_LDFLAG="-no-undefined" ;;
    no)  NO_UNDEFINED_LDFLAG="" ;;
    *) AC_MSG_ERROR([bad value ${enableval} for --enable-link-all-depenencies]) ;;
   esac], [NO_UNDEFINED_LDFLAG="-no-undefined"])
AC_SUBST(NO_UNDEFINED_LDFLAG)

AC_ARG_ENABLE([link-all-dependencies],
  [AS_HELP_STRING([--enable-link-all-dependencies],
    [link Octave and its shared libraries with all dependencies, not just those immediately referenced (should not be needed on most systems)])],
  [case "${enableval}" in
    yes) link_all_deps=true ;;
    no)  link_all_deps=false ;;
    *) AC_MSG_ERROR([bad value ${enableval} for --enable-link-all-depenencies]) ;;
   esac], [link_all_deps=false])
AM_CONDITIONAL([AMCOND_LINK_ALL_DEPS], [test x$link_all_deps = xtrue])

### Type stuff.

AC_TYPE_MODE_T
AC_TYPE_OFF_T
AC_TYPE_PID_T
AC_TYPE_SIZE_T
AC_TYPE_UID_T
AC_CHECK_TYPES([dev_t, ino_t])
AC_CHECK_TYPES([long long int, unsigned long long int])

### How big are ints and how are they oriented?  These could probably
### be eliminated in favor of run-time checks.

AC_CHECK_SIZEOF(short)
AC_CHECK_SIZEOF(int)
AC_CHECK_SIZEOF(long)
AC_CHECK_SIZEOF(long long)

### Does the C compiler handle alloca() and const correctly?

AC_FUNC_ALLOCA

### See if we should use placement delete.

OCTAVE_PLACEMENT_DELETE

### See if we can auto allocate variable sized arrays.

OCTAVE_DYNAMIC_AUTO_ARRAYS

### See if we can use fast integer arithmetics

OCTAVE_FAST_INT_OPS

### Check for long double type (for 64-bit integers)

AC_CHECK_SIZEOF(long double)

### Checks for header files.

AC_HEADER_DIRENT
AC_HEADER_SYS_WAIT

### C headers

AC_CHECK_HEADERS(curses.h direct.h dlfcn.h floatingpoint.h grp.h \
  ieeefp.h inttypes.h locale.h memory.h ncurses.h poll.h pthread.h \
  pwd.h sunmath.h sys/ioctl.h sys/param.h sys/poll.h sys/resource.h \
  sys/select.h sys/utsname.h termcap.h)

### C++ headers

AC_LANG_PUSH(C++)
AC_CHECK_HEADERS(sstream)
AC_CHECK_HEADERS([unordered_map], [], [
  AC_CHECK_HEADERS([tr1/unordered_map])])
AC_MSG_CHECKING([whether unordered_map requires tr1 namespace])
unordered_map_requires_tr1_namespace=no
if test "$ac_cv_header_unordered_map" = "yes"; then
  ### Have <unordered_map>, but still have to check whether
  ### tr1 namespace is required (like MSVC, for instance).
  AC_COMPILE_IFELSE([
    AC_LANG_PROGRAM([
      #include <unordered_map>
    ], [
      std::unordered_map m;
    ])], [], [unordered_map_requires_tr1_namespace=yes])
elif test "$ac_cv_header_tr1_unordered_map" = "yes"; then
  unordered_map_requires_tr1_namespace=yes
fi
if test "$unordered_map_requires_tr1_namespace" = "yes"; then
  AC_DEFINE(USE_UNORDERED_MAP_WITH_TR1, 1, [Defines whether unordered_map requires the use of tr1 namespace.])
fi
AC_MSG_RESULT([$unordered_map_requires_tr1_namespace])
AC_LANG_POP(C++)

have_termios_h=no
AC_CHECK_HEADERS(termios.h, have_termios_h=yes)
AC_CHECK_HEADERS(termio.h, have_termio_h=yes, have_termio_h=no)
AC_CHECK_HEADERS(sgtty.h, have_sgtty_h=yes, have_sgtty_h=no)
AC_CHECK_HEADERS(fnmatch.h, have_fnmatch_h=yes, have_fnmatch_h=no)
AC_CHECK_HEADERS(conio.h, have_conio_h=yes, have_conio_h=no)

if test "$have_termios_h" = yes \
    || test "$have_termio_h" = yes \
    || test "$have_sgtty_h" = yes; then
  true
else
  AC_MSG_WARN([I couldn't find termios.h, termio.h, or sgtty.h!])
fi

### Checks for functions and variables.

AC_CHECK_FUNCS(basename canonicalize_file_name \
  chmod dup2 endgrent endpwent execvp expm1 expm1f fork \
  getegid geteuid getgid getgrent getgrgid getgrnam getpgrp getpid \
  getppid getpwent getpwuid getuid getwd _kbhit kill \
  lgamma lgammaf lgamma_r lgammaf_r localtime_r log1p log1pf \
  mkstemp pipe putenv \
  realpath resolvepath rindex roundl select setgrent setlocale \
  setpwent setvbuf siglongjmp \
  strsignal tempnam tgammaf umask \
  uname utime waitpid \
  _chmod x_utime _utime32)

AC_LANG_PUSH(C++)
AC_CHECK_DECLS([exp2, round, tgamma], [], [], [[#include <cmath>]])
AC_CHECK_FUNCS([exp2 round tgamma])
AH_VERBATIM([Z_FUNCS_AND_DECLS], [
#if defined (__cplusplus)
extern "C" {
#endif
#if HAVE_EXP2 && ! HAVE_DECL_EXP2
double exp2 (double );
#endif
#if HAVE_ROUND && ! HAVE_DECL_ROUND
double round (double);
#endif
#if HAVE_TGAMMA && ! HAVE_DECL_TGAMMA
double tgamma (double);
#endif
#if defined (__cplusplus)
}
#endif
])
AC_LANG_POP(C++)

case "$canonical_host_type" in
  *-*-mingw*)
    ## MinGW does not provide a mkstemp function.  However, it provides
    ## the mkstemps function in libiberty.
    AC_MSG_CHECKING([for mkstemps in libiberty])
    save_LIBS="$LIBS"
    LIBS="-liberty $LIBS"
    AC_LINK_IFELSE([
      AC_LANG_PROGRAM([[int mkstemps (char *pattern, int suffix_len);]], 
       [[mkstemps ("XXXXXX", 0);]]
    )],
    [AC_MSG_RESULT(yes)
     HAVE_MKSTEMPS=yes
     AC_DEFINE(HAVE_MKSTEMPS, 1, [Define if mkstemps is available in libiberty.])
    ],
    [AC_MSG_RESULT(no)
     HAVE_MKSTEMPS=no
     LIBS="$save_LIBS"
    ])
   ;;
esac

OCTAVE_SMART_PUTENV

case "$canonical_host_type" in
  *-*-msdosmsvc | *-*-mingw*)
    AC_MSG_CHECKING([for required _WIN32_WINNT])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <windows.h>
#if _WIN32_WINNT < 0x0403
#error "Wrong version"
#endif]], [])],
      AC_MSG_RESULT([none]), [
        AC_DEFINE(_WIN32_WINNT, 0x0403, [Define to 0x0403 to access InitializeCriticalSectionAndSpinCount])
        AC_MSG_RESULT([0x0403])])
    AC_MSG_CHECKING([whether _USE_MATH_DEFINES needs to be defined])
    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],
[[int x = M_LN2;]])],
      AC_MSG_RESULT([no]), [
        AC_DEFINE(_USE_MATH_DEFINES, 1, [Define if your system needs it to define math constants like M_LN2])
        AC_MSG_RESULT([yes])])
  ;;
esac

### Dynamic linking is now enabled only if we are building shared
### libs and some API for dynamic linking is detected.

## FIXME -- a lot of the following duplicates the functionality of
## code generated by the dlopen option for LT_INIT.

LD_CXX='$(CXX)'
RDYNAMIC_FLAG=
DL_API_MSG=""
dlopen_api=false
shl_load_api=false
loadlibrary_api=false
dyld_api=false

if $SHARED_LIBS || $ENABLE_DYNAMIC_LINKING; then

  case "$lt_cv_dlopen" in
    dlopen)
      dlopen_api=true
      DL_API_MSG="(dlopen)"
      AC_DEFINE(HAVE_DLOPEN_API, 1, [Define if your system has dlopen, dlsym, dlerror, and dlclose for dynamic linking])
      OCTAVE_CXX_FLAG(-rdynamic, [RDYNAMIC_FLAG=-rdynamic])
    ;;
    shl_load)
      shl_load_api=true
      DL_API_MSG="(shl_load)"
      AC_DEFINE(HAVE_SHL_LOAD_API, 1, [Define if your system has shl_load and shl_findsym for dynamic linking])
    ;;
    LoadLibrary)
      loadlibrary_api=true
      DL_API_MSG="(LoadLibrary)"
      AC_DEFINE(HAVE_LOADLIBRARY_API, 1, [Define if your system has LoadLibrary for dynamic linking])
    ;;
    dyld)
      dyld_api=true
      DL_API_MSG="(dyld)"
      AC_DEFINE(HAVE_DYLD_API, 1, [Define if your system has dyld for dynamic linking])
    ;;
  esac

  DL_LIBS="$lt_cv_dlopen_libs"
  AC_SUBST(DL_LIBS)

  ## Disable dynamic linking if capability is not present.
  if $dlopen_api || $shl_load_api || $loadlibrary_api || $dyld_api; then
    true
  else
    ENABLE_DYNAMIC_LINKING=false
  fi
fi

if $ENABLE_DYNAMIC_LINKING; then
  AC_DEFINE(ENABLE_DYNAMIC_LINKING, 1, [Define if using dynamic linking])
fi

AM_CONDITIONAL([AMCOND_ENABLE_DYNAMIC_LINKING],
  [test x$ENABLE_DYNAMIC_LINKING = xtrue])

if $SHARED_LIBS; then
   LIBOCTINTERP=-loctinterp$SHLLINKEXT
   LIBOCTAVE=-loctave$SHLLINKEXT
   LIBCRUFT=-lcruft$SHLLINKEXT
else
  LIBOCTINTERP='$(top_builddir)/src/liboctinterp.$(LIBEXT)'
  LIBOCTAVE='$(top_builddir)/liboctave/liboctave.$(LIBEXT)'
  LIBCRUFT='$(top_builddir)/libcruft/libcruft.$(LIBEXT)'
fi

AC_SUBST(LD_CXX)
AC_SUBST(RDYNAMIC_FLAG)
AC_SUBST(ENABLE_DYNAMIC_LINKING)
AC_SUBST(LIBOCTINTERP)
AC_SUBST(LIBOCTAVE)
AC_SUBST(LIBCRUFT)

dnl Maybe <cmath> defines the IEEE functions we need.

OCTAVE_CMATH_FUNC(isnan)
OCTAVE_CMATH_FUNC(isinf)
OCTAVE_CMATH_FUNC(isfinite)

dnl Would like to get rid of this cruft, and just have
dnl
dnl   AC_CHECK_FUNCS(finite isnan isinf)
dnl
dnl instead, but that used to fail on some systems...
dnl
dnl Also just using AC_CHECK_FUNCS doesn't seem to work to find isinf
dnl and isnan on Linux systems, so we use AC_CHECK_FUNC, and if that
dnl fails, we try again by including math.h and invoking the function
dnl with an argument. 

### I am told that Inf and NaN don't work on m68k HP sytems.

case "$canonical_host_type" in
  m68k-hp-hpux*)
  ;;
  *)
    AC_CHECK_FUNCS(finite isnan isinf signbit)
    AC_CHECK_FUNCS(_finite _isnan)
    AC_CHECK_DECLS(signbit, , , [#include <math.h>])
  ;;
esac

### Check for nonstandard but common math functions that we need.

AC_CHECK_FUNCS(acosh acoshf asinh asinhf atanh atanhf erf erff erfc erfcf exp2f log2 log2f)
AC_CHECK_FUNCS(hypotf _hypotf cbrt cbrtf)

### Checks for OS specific cruft.

AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_blocks, struct stat.st_rdev])

AC_STRUCT_TIMEZONE
AC_FUNC_CLOSEDIR_VOID

AC_CHECK_MEMBERS(struct group.gr_passwd)

octave_found_termlib=no
for termlib in ncurses curses termcap terminfo termlib; do
  AC_CHECK_LIB(${termlib}, tputs, [
    TERM_LIBS="-l${termlib}"
    octave_found_termlib=yes
    break])
done

if test "$octave_found_termlib" = no; then
  warn_termlibs="I couldn't find -ltermcap, -lterminfo, -lncurses, -lcurses, o\
r -ltermlib!"
  AC_MSG_WARN([$warn_termlibs])
fi
AC_SUBST(TERM_LIBS)

OCTAVE_ENABLE_READLINE

AC_MSG_CHECKING([for struct exception in math.h])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],
  [[struct exception *x; x->type; x->name;]])],
  [AC_MSG_RESULT(yes)
   AC_DEFINE(EXCEPTION_IN_MATH, 1,
     [Define if your math.h declares struct exception for matherr().])],
  [AC_MSG_RESULT(no)])

### Signal stuff.

AC_CHECK_DECLS([sys_siglist], [], [],
[#include <signal.h>
/* NetBSD declares sys_siglist in unistd.h.  */
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
])

### A system dependent kluge or two.

AC_CHECK_FUNCS(getrusage)
case "$canonical_host_type" in
  *-*-cygwin*)
    AC_DEFINE(RUSAGE_TIMES_ONLY, 1, [Define if your struct rusage only has time information.])
  ;;
esac

### Checks for other programs used for building, testing, installing,
### and running Octave.

AC_PROG_AWK
OCTAVE_PROG_FIND
OCTAVE_PROG_SED
OCTAVE_PROG_PERL
OCTAVE_PROG_PYTHON

OCTAVE_PROG_FLEX
AC_SUBST([LEX_OUTPUT_ROOT], [lex.octave_])

OCTAVE_PROG_BISON

AC_PROG_LN_S

AC_PROG_INSTALL
INSTALL_SCRIPT='${INSTALL}'
AC_SUBST(INSTALL_SCRIPT)

OCTAVE_PROG_DESKTOP_FILE_INSTALL

OCTAVE_PROG_GNUPLOT
OCTAVE_PROG_PAGER
OCTAVE_PROG_GPERF

OCTAVE_PROG_GHOSTSCRIPT
OCTAVE_PROG_TEXI2DVI
OCTAVE_PROG_TEXI2PDF

### Even though we include config.h, we need to have the preprocessor
### defines available in a variable for the testif feature of the
### scripts/testfun/test.m function.  Use UGLY_DEFS to hold all the -D
### options.  These are ultimately placed in the DEFS field of the
### struct returned by octave_config_info, which is used by test.m.

AC_OUTPUT_MAKE_DEFS

### We have to insert extra levels of backslash quoting here so that
### the right thing ends up in oct-conf.h.
UGLY_DEFS=`echo $DEFS | $SED 's,\\",\\\\\\\\\\\\\\\\\\",g'`
AC_MSG_NOTICE([defining UGLY_DEFS to be $UGLY_DEFS])
AC_SUBST(UGLY_DEFS)

### Maybe add -Wall, -W, and -Wshadow to compiler flags now that we're
### done feature testing. 

GCC_EXTRA_FLAGS="-Wall -W -Wshadow -Wformat -Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings -Wcast-align -Wcast-qual"

GXX_EXTRA_FLAGS="-Wall -W -Wshadow -Wold-style-cast -Wformat -Wpointer-arith -Wwrite-strings -Wcast-align -Wcast-qual"

try_extra_warning_flags=true

AC_ARG_ENABLE(extra-warning-flags,
  [AS_HELP_STRING([--enable-extra-warning-flags],
     [add -Wall, -W, -Wshadow, and -Wold-style-cast options to CFLAGS and CXXFLAGS  (on by default, but only if the compiler appears to accept them)])],
  [if test "$enableval" = no; then
     try_extra_warning_flags=false
   fi], [])

if $try_extra_warning_flags; then
  for flag in $GCC_EXTRA_FLAGS; do
    OCTAVE_CC_FLAG($flag, [
      WARN_CFLAGS="$WARN_CFLAGS $flag";
      AC_MSG_RESULT([adding $flag to WARN_CFLAGS])])
  done
  for flag in $GXX_EXTRA_FLAGS; do
    OCTAVE_CXX_FLAG($flag, [
      WARN_CXXFLAGS="$WARN_CXXFLAGS $flag";
      AC_MSG_RESULT([adding $flag to WARN_CXXFLAGS])])
  done
fi

GCC_STRICT_FLAGS="-Wconversion"

GXX_STRICT_FLAGS="-Wconversion -Weffc++"

try_strict_warning_flags=false

AC_ARG_ENABLE(strict-warning-flags,
  [AS_HELP_STRING([--enable-strict-warning-flags],
     [add extra strict warning options to CFLAGS and CXXFLAGS (off by default)])],
  [if test "$enableval" = yes; then
     try_strict_warning_flags=true
   fi], [])

if $try_strict_warning_flags; then
  for flag in $GCC_STRICT_FLAGS; do
    OCTAVE_CC_FLAG($flag, [
      WARN_CFLAGS="$WARN_CFLAGS $flag";
      AC_MSG_RESULT([adding $flag to WARN_CFLAGS])])
  done
  for flag in $GXX_STRICT_FLAGS; do
    OCTAVE_CXX_FLAG($flag, [
      WARN_CXXFLAGS="$WARN_CXXFLAGS $flag";
      AC_MSG_RESULT([adding $flag to WARN_CXXFLAGS])])
  done
fi

AC_SUBST(WARN_CFLAGS)
AC_SUBST(WARN_CXXFLAGS)

### Run configure in subdirectories.

export CC
export CXX
export F77

### Some things to add to the bottom of config.h.

AH_BOTTOM([
#if !defined (GNULIB_NAMESPACE)
#define GNULIB_NAMESPACE gnulib
#endif

#if defined (__GNUC__)
#define GCC_ATTR_DEPRECATED __attribute__ ((__deprecated__))
#define GCC_ATTR_NORETURN __attribute__ ((__noreturn__))
#define GCC_ATTR_UNUSED __attribute__ ((__unused__))
#else
#define GCC_ATTR_DEPRECATED
#define GCC_ATTR_NORETURN
#define GCC_ATTR_UNUSED
#endif

#define X_CAST(T, E) (T) (E)

#if defined (CXX_BROKEN_REINTERPRET_CAST)
#define FCN_PTR_CAST(T, E) (T) (E)
#else
#define FCN_PTR_CAST(T, E) reinterpret_cast<T> (E)
#endif

#if !defined(HAVE_DEV_T)
typedef short dev_t;
#endif

#if !defined(HAVE_INO_T)
typedef unsigned long ino_t;
#endif

#if defined (_MSC_VER)
#define __WIN32__
#define WIN32
/* missing parameters in macros */
#pragma warning (disable: 4003)
/* missing implementations in template instantiation */
#pragma warning (disable: 4996)
/* deprecated function names (FIXME?) */
#pragma warning (disable: 4661)
#endif

#if defined (__WIN32__) && ! defined (__CYGWIN__)
#define OCTAVE_HAVE_WINDOWS_FILESYSTEM 1
#elif defined (__CYGWIN__)
#define OCTAVE_HAVE_WINDOWS_FILESYSTEM 1
#define OCTAVE_HAVE_POSIX_FILESYSTEM 1
#else
#define OCTAVE_HAVE_POSIX_FILESYSTEM 1
#endif

/* Define if we expect to have <windows.h>, Sleep, etc. */
#if defined (__WIN32__) && ! defined (__CYGWIN__)
#define OCTAVE_USE_WINDOWS_API 1
#endif

#if defined (__APPLE__) && defined (__MACH__)
#define OCTAVE_USE_OS_X_API 1
#endif

/* sigsetjmp is a macro, not a function. */
#if defined (sigsetjmp) && defined (HAVE_SIGLONGJMP)
#define OCTAVE_HAVE_SIG_JUMP
#endif

#if defined (_UNICOS)
#define F77_USES_CRAY_CALLING_CONVENTION
#endif

#if 0
#define F77_USES_VISUAL_FORTRAN_CALLING_CONVENTION
#endif

#ifdef USE_64_BIT_IDX_T
#define SIZEOF_OCTAVE_IDX_TYPE 8
#else
#define SIZEOF_OCTAVE_IDX_TYPE SIZEOF_INT
#endif

/* To be able to use long doubles for 64-bit mixed arithmetics, we need
   them at least 80 bits wide and we need roundl declared in math.h.
   FIXME -- maybe substitute this by a more precise check in the future.  */
#if (SIZEOF_LONG_DOUBLE >= 10) && defined (HAVE_ROUNDL)
#define OCTAVE_INT_USE_LONG_DOUBLE
#endif

#define OCTAVE_EMPTY_CPP_ARG

/* Octave is currently unable to use FFTW unless both float
   and double versions are both available.  */
#if defined (HAVE_FFTW3) && defined (HAVE_FFTW3F)
#define HAVE_FFTW
#endif

/* Backward compatibility.  */
#if defined (HAVE_Z)
#define HAVE_ZLIB
#endif

/* oct-dlldefs.h */

#if defined (_MSC_VER)
#define OCTAVE_EXPORT __declspec(dllexport)
#define OCTAVE_IMPORT __declspec(dllimport)
#else
/* All other compilers, at least for now. */
#define OCTAVE_EXPORT
#define OCTAVE_IMPORT
#endif

/* API macro for libcruft */
#ifdef CRUFT_DLL
#define CRUFT_API OCTAVE_EXPORT
#else
#define CRUFT_API OCTAVE_IMPORT
#endif

/* API macro for liboctave */
#ifdef OCTAVE_DLL
#define OCTAVE_API OCTAVE_EXPORT
#else
#define OCTAVE_API OCTAVE_IMPORT
#endif

/* API macro for src */
#ifdef OCTINTERP_DLL
#define OCTINTERP_API OCTAVE_EXPORT
#else
#define OCTINTERP_API OCTAVE_IMPORT
#endif

/* API macro for src/graphics */
#ifdef OCTGRAPHICS_DLL
#define OCTGRAPHICS_API OCTAVE_EXPORT
#else
#define OCTGRAPHICS_API OCTAVE_IMPORT
#endif

/* oct-types.h */

typedef OCTAVE_IDX_TYPE octave_idx_type;

#include <stdint.h>

/* Tag indicating octave config.h has been included */
#define OCTAVE_CONFIG_INCLUDED 1
])

### Do the substitutions in all the Makefiles.

AC_SUBST(ac_config_files)
AC_SUBST(ac_config_headers)

AC_CONFIG_FILES([
  Makefile 
  doc/Makefile
  doc/faq/Makefile
  doc/icons/Makefile
  doc/interpreter/Makefile
  doc/liboctave/Makefile
  doc/refcard/Makefile
  examples/Makefile
  libcruft/Makefile
  libcruft/mkf77def
  libgnu/Makefile
  liboctave/Makefile
  scripts/Makefile
  src/Makefile
  test/Makefile])

AC_OUTPUT

### Print a summary so that important information isn't missed.

AC_MSG_NOTICE([

Octave is now configured for $canonical_host_type

  Source directory:            $srcdir
  Installation prefix:         $prefix
  C compiler:                  $CC $XTRA_CFLAGS $WARN_CFLAGS $CFLAGS
  C++ compiler:                $CXX $XTRA_CXXFLAGS $WARN_CXXFLAGS $CXXFLAGS
  Fortran compiler:            $F77 $FFLAGS
  Fortran libraries:           $FLIBS
  Lex libraries:               $LEXLIB
  LIBS:                        $LIBS

  AMD CPPFLAGS:                $AMD_CPPFLAGS
  AMD LDFLAGS:                 $AMD_LDFLAGS
  AMD libraries:               $AMD_LIBS
  ARPACK CPPFLAGS:             $ARPACK_CPPFLAGS
  ARPACK LDFLAGS:              $ARPACK_LDFLAGS
  ARPACK libraries:            $ARPACK_LIBS
  BLAS libraries:              $BLAS_LIBS
  CAMD CPPFLAGS:               $CAMD_CPPFLAGS
  CAMD LDFLAGS:                $CAMD_LDFLAGS
  CAMD libraries:              $CAMD_LIBS
  CARBON libraries:            $CARBON_LIBS
  CCOLAMD CPPFLAGS:            $CCOLAMD_CPPFLAGS
  CCOLAMD LDFLAGS:             $CCOLAMD_LDFLAGS
  CCOLAMD libraries:           $CCOLAMD_LIBS
  CHOLMOD CPPFLAGS:            $CHOLMOD_CPPFLAGS
  CHOLMOD LDFLAGS:             $CHOLMOD_LDFLAGS
  CHOLMOD libraries:           $CHOLMOD_LIBS
  COLAMD CPPFLAGS:             $COLAMD_CPPFLAGS
  COLAMD LDFLAGS:              $COLAMD_LDFLAGS
  COLAMD libraries:            $COLAMD_LIBS
  CURL CPPFLAGS:               $CURL_CPPFLAGS
  CURL LDFLAGS:                $CURL_LDFLAGS
  CURL libraries:              $CURL_LIBS
  CXSPARSE CPPFLAGS:           $CXSPARSE_CPPFLAGS
  CXSPARSE LDFLAGS:            $CXSPARSE_LDFLAGS
  CXSPARSE libraries:          $CXSPARSE_LIBS
  DL libraries:                $DL_LIBS
  FFTW3 CPPFLAGS:              $FFTW3_CPPFLAGS
  FFTW3 LDFLAGS:               $FFTW3_LDFLAGS
  FFTW3 libraries:             $FFTW3_LIBS
  FFTW3F CPPFLAGS:             $FFTW3F_CPPFLAGS
  FFTW3F LDFLAGS:              $FFTW3F_LDFLAGS
  FFTW3F libraries:            $FFTW3F_LIBS
  fontconfig CFLAGS:           $FONTCONFIG_CFLAGS
  fontconfig LIBS:             $FONTCONFIG_LIBS
  FT2_CFLAGS:                  $FT2_CFLAGS
  FT2_LIBS:                    $FT2_LIBS
  GLPK CPPFLAGS:               $GLPK_CPPFLAGS
  GLPK LDFLAGS:                $GLPK_LDFLAGS
  GLPK libraries:              $GLPK_LIBS
  graphics CFLAGS:             $GRAPHICS_CFLAGS
  graphics LIBS:               $GRAPHICS_LIBS
  Magick++ CPPFLAGS:           $MAGICK_CPPFLAGS
  Magick++ LDFLAGS:            $MAGICK_LDFLAGS
  Magick++ libraries:          $MAGICK_LIBS
  HDF5 CPPFLAGS:               $HDF5_CPPFLAGS
  HDF5 LDFLAGS:                $HDF5_LDFLAGS
  HDF5 libraries:              $HDF5_LIBS
  LAPACK libraries:            $LAPACK_LIBS
  OPENGL libraries:            $OPENGL_LIBS
  PTHREAD flags:               $PTHREAD_CFLAGS
  PTHREAD libraries:           $PTHREAD_LIBS
  QHULL CPPFLAGS:              $QHULL_CPPFLAGS
  QHULL LDFLAGS:               $QHULL_LDFLAGS
  QHULL libraries:             $QHULL_LIBS
  QRUPDATE libraries:          $QRUPDATE_LIBS
  READLINE libraries:          $READLINE_LIBS
  REGEX libraries:             $REGEX_LIBS
  TERM libraries:              $TERM_LIBS
  UMFPACK libraries:           $UMFPACK_LIBS
  X11 include flags:           $X11_INCFLAGS
  X11 libraries:               $X11_LIBS
  Z CPPFLAGS:                  $Z_CPPFLAGS
  Z LDFLAGS:                   $Z_LDFLAGS
  Z libraries:                 $Z_LIBS

  Default pager:               $DEFAULT_PAGER
  gnuplot:                     $GNUPLOT

  Do internal array bounds checking:  $BOUNDS_CHECKING
  Use octave_allocator:               $USE_OCTAVE_ALLOCATOR
  Build static libraries:             $STATIC_LIBS
  Build shared libraries:             $SHARED_LIBS
  Dynamic Linking:                    $ENABLE_DYNAMIC_LINKING $DL_API_MSG
  Include support for GNU readline:   $USE_READLINE
  64-bit array dims and indexing:     $USE_64_BIT_IDX_T
])

warn_msg_printed=false

if $ENABLE_DYNAMIC_LINKING; then
  if $SHARED_LIBS; then
    true
  else
    AC_MSG_WARN([You used --enable-dl but not --enable-shared.])
    AC_MSG_WARN([Are you sure that is what you want to do?])
    warn_msg_printed=true
  fi
fi

if test -n "$gxx_only"; then
  AC_MSG_WARN([$gxx_only])
  warn_msg_printed=true
fi

if test -n "$warn_gcc_version"; then
  AC_MSG_WARN([$warn_gcc_version])
  warn_msg_printed=true
fi

if test -n "$warn_gcc_only"; then
  AC_MSG_WARN([$warn_gcc_only])
  warn_msg_printed=true
fi

if test -n "$warn_readline"; then
  AC_MSG_WARN([$warn_readline])
  warn_msg_printed=true
fi

if test -n "$warn_termlibs"; then
  AC_MSG_WARN([$warn_termlibs])
  warn_msg_printed=true
fi

if test -n "$warn_gperf"; then
  AC_MSG_WARN([$warn_gperf])
  warn_msg_printed=true
fi

if test -n "$warn_flex"; then
  AC_MSG_WARN([$warn_flex])
  warn_msg_printed=true
fi

if test -n "$warn_bison"; then
  AC_MSG_WARN([$warn_bison])
  warn_msg_printed=true
fi

if test -n "$warn_less"; then
  AC_MSG_WARN([$warn_less])
  warn_msg_printed=true
fi

if test -n "$warn_umfpack"; then
  AC_MSG_WARN([$warn_umfpack])
  warn_msg_printed=true
fi

if test -n "$warn_qrupdate"; then
  AC_MSG_WARN([$warn_qrupdate])
  warn_msg_printed=true
fi

if test -n "$warn_amd"; then
  AC_MSG_WARN([$warn_amd])
  warn_msg_printed=true
fi

if test -n "$warn_colamd"; then
  AC_MSG_WARN([$warn_colamd])
  warn_msg_printed=true
fi

if test -n "$warn_ccolamd"; then
  AC_MSG_WARN([$warn_ccolamd])
  warn_msg_printed=true
fi

if test -n "$warn_cholmod"; then
  AC_MSG_WARN([$warn_cholmod])
  warn_msg_printed=true
fi

if test -n "$warn_cxsparse"; then
  AC_MSG_WARN([$warn_cxsparse])
  warn_msg_printed=true
fi

if test -n "$warn_curl"; then
  AC_MSG_WARN([$warn_curl])
  warn_msg_printed=true
fi

if test -n "$warn_fftw"; then
  AC_MSG_WARN([$warn_fftw])
  warn_msg_printed=true
fi

if test -n "$warn_glpk"; then
  AC_MSG_WARN([$warn_glpk])
  warn_msg_printed=true
fi

if test -n "$warn_magick"; then
  AC_MSG_WARN([$warn_magick])
  warn_msg_printed=true
fi

if test -n "$warn_hdf5"; then
  AC_MSG_WARN([$warn_hdf5])
  warn_msg_printed=true
fi

if test -n "$warn_regex"; then
  AC_MSG_WARN([$warn_regex])
  warn_msg_printed=true
fi

if test -n "$warn_pcre"; then
  AC_MSG_WARN([$warn_pcre])
  warn_msg_printed=true
fi

if test -n "$warn_qhull"; then
  AC_MSG_WARN([$warn_qhull])
  warn_msg_printed=true
fi

if test -n "$warn_zlib"; then
  AC_MSG_WARN([$warn_zlib])
  warn_msg_printed=true
fi

if test -n "$warn_ghostscript"; then
  AC_MSG_WARN([$warn_ghostscript])
  warn_msg_printed=true
fi

if test -n "$warn_texi2dvi"; then
  AC_MSG_WARN([$warn_texi2dvi])
  warn_msg_printed=true
fi

if test -n "$warn_texi2pdf"; then
  AC_MSG_WARN([$warn_texi2pdf])
  warn_msg_printed=true
fi

if test -n "$warn_docs"; then
  AC_MSG_WARN([$warn_docs])
  warn_msg_printed=true
fi

if test -n "$warn_64_bit"; then
  AC_MSG_WARN([$warn_64_bit])
  warn_msg_printed=true
fi

if $USE_64_BIT_IDX_T; then
  AC_MSG_WARN([])
  AC_MSG_WARN([You used the EXPERIMENTAL --enable-64 option.])
  AC_MSG_WARN([Are you sure that is what you want to do?])
  AC_MSG_WARN([])
  AC_MSG_WARN([Your Fortran compiler must have an option to generate])
  AC_MSG_WARN([code with 8 byte signed INTEGER values.  This option])
  AC_MSG_WARN([should be specified in the F77_INTEGER_8_FLAG variable])
  AC_MSG_WARN([Make.  This should work automatically for gfortran.  If])
  AC_MSG_WARN([you use another compiler, you will need to set this])
  AC_MSG_WARN([variable on the configure command line.  You must also])
  AC_MSG_WARN([compile the ARPACK, BLAS, LAPACK, QRUPDATE, and SuiteSparse])
  AC_MSG_WARN([libraries to use 8 byte signed integers for array indexing.])
  AC_MSG_WARN([])
  warn_msg_printed=true
fi

if $USE_OPENMP; then
  AC_MSG_WARN([])
  AC_MSG_WARN([You used the EXPERIMENTAL --enable-openmp option.])
  AC_MSG_WARN([Are you sure that is what you want to do?])
  AC_MSG_WARN([])
  AC_MSG_WARN([This option enables experimental SMP multithreding])
  AC_MSG_WARN([code that has had very little testing. There is no])
  AC_MSG_WARN([certainity that the results returned by Octave with])
  AC_MSG_WARN([this option enabled will be correct.])
  AC_MSG_WARN([])
  warn_msg_printed=true
fi

native_graphics=true
if test -n "$warn_opengl"; then
  AC_MSG_WARN([$warn_opengl])
  native_graphics=false
  warn_msg_printed=true
fi

if test -n "$warn_freetype"; then
  AC_MSG_WARN([$warn_freetype])
  native_graphics=false
  warn_msg_printed=true
fi

if test -n "$warn_fontconfig"; then
  AC_MSG_WARN([$warn_fontconfig])
  native_graphics=false
  warn_msg_printed=true
fi

if test -n "$warn_fltk_config"; then
  AC_MSG_WARN([$warn_fltk_config])
  native_graphics=false
  warn_msg_printed=true
fi

if test -n "$warn_fltk_opengl"; then
  AC_MSG_WARN([$warn_fltk_opengl])
  native_graphics=false
  warn_msg_printed=true
fi

if $native_graphics; then
  true;
else
  AC_MSG_WARN([])
  AC_MSG_WARN([I didn't find the necessary libraries to compile native])
  AC_MSG_WARN([graphics.  It isn't necessary to have native graphics,])
  AC_MSG_WARN([but you will need to have gnuplot installed or you won't])
  AC_MSG_WARN([be able to use any of Octave's plotting commands])
  AC_MSG_WARN([])
  warn_msg_printed=true
fi

if test -n "$warn_gnuplot"; then
  if $native_graphics; then
    AC_MSG_WARN([])
    AC_MSG_WARN([I didn't find gnuplot.  Plotting commands will use the])
    AC_MSG_WARN([native graphics toolkit.])
  else
    AC_MSG_WARN([I didn't find gnuplot.  It isn't necessary to have gnuplot])
    AC_MSG_WARN([installed, but you won't be able to use any of Octave's])
    AC_MSG_WARN([plotting commands without it.])
  fi
  AC_MSG_WARN([])
  AC_MSG_WARN([If gnuplot is installed, but isn't in your path, you can])
  AC_MSG_WARN([tell Octave where to find it by using the gnuplot_binary])
  AC_MSG_WARN([function.  For example,])
  AC_MSG_WARN([])
  AC_MSG_WARN([gnuplot_binary ("/full/path/and/name/of/gnuplot/binary")])
  AC_MSG_WARN([])
  AC_MSG_WARN([at the Octave prompt.])
  AC_MSG_WARN([])
  AC_MSG_WARN([Setting default value to $GNUPLOT])
  AC_MSG_WARN([])

  warn_msg_printed=true
fi

if $USE_ATOMIC_REFCOUNT; then
  AC_MSG_WARN([])
  AC_MSG_WARN([Using atomic reference counting.])
  AC_MSG_WARN([This feature allows to access octave data safely from])
  AC_MSG_WARN([another thread, for instance from a GUI. However this])
  AC_MSG_WARN([results in a small performance penalty in the octave])
  AC_MSG_WARN([interpreter.])
  AC_MSG_WARN([])
  if $USE_OCTAVE_ALLOCATOR; then
    AC_MSG_WARN([Thread-safe behavior is not guaranteed unless you also])
    AC_MSG_WARN([disable the use of the octave_allocator class.])
    AC_MSG_WARN([])
  fi
  warn_msg_printed=true
fi

if $warn_msg_printed; then
  AC_MSG_NOTICE([])
  AC_MSG_NOTICE([NOTE: libraries may be skipped if a library is not found OR])
  AC_MSG_NOTICE([NOTE: if the library on your system is missing required features.])
fi

### End of configure.