--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-31  Bruno Haible  <bruno@clisp.org>
+
+	Add support for Minix with ACK compiler.
+	* m4/gnulib-common.m4 (gl_PROG_AR_RANLIB): New macro.
+	* gnulib-tool (func_import, func_create_testdir): Emit invocation of
+	gl_PROG_AR_RANLIB instead of AC_PROG_RANLIB.
+
 2011-07-31  Bruno Haible  <bruno@clisp.org>
 
 	Documentation about Minix.

--- a/gnulib-tool
+++ b/gnulib-tool
@@ -5126,7 +5126,7 @@
     echo "  m4_pattern_allow([^gl_ES\$])dnl a valid locale name"
     echo "  m4_pattern_allow([^gl_LIBOBJS\$])dnl a variable"
     echo "  m4_pattern_allow([^gl_LTLIBOBJS\$])dnl a variable"
-    echo "  AC_REQUIRE([AC_PROG_RANLIB])"
+    echo "  AC_REQUIRE([gl_PROG_AR_RANLIB])"
     if test -n "$uses_subdirs"; then
       echo "  AC_REQUIRE([AM_PROG_CC_C_O])"
     fi
@@ -5735,7 +5735,7 @@
        echo "AC_PROG_CC"
        echo "AC_PROG_INSTALL"
        echo "AC_PROG_MAKE_SET"
-       echo "AC_PROG_RANLIB"
+       echo "gl_PROG_AR_RANLIB"
        echo
        if test -n "$uses_subdirs"; then
          echo "AM_PROG_CC_C_O"
@@ -5850,7 +5850,7 @@
    echo "m4_pattern_allow([^gl_LIBOBJS\$])dnl a variable"
    echo "m4_pattern_allow([^gl_LTLIBOBJS\$])dnl a variable"
    echo
-   echo "AC_PROG_RANLIB"
+   echo "gl_PROG_AR_RANLIB"
    echo
    if test -n "$any_uses_subdirs"; then
      echo "AM_PROG_CC_C_O"

--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -1,4 +1,4 @@
-# gnulib-common.m4 serial 28
+# gnulib-common.m4 serial 29
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -211,6 +211,35 @@
 [m4_define([AS_VAR_IF],
 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
 
+# gl_PROG_AR_RANLIB
+# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
+AC_DEFUN([gl_PROG_AR_RANLIB],
+[
+  dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
+  dnl as "cc", and GCC as "gcc". They have different object file formats and
+  dnl library formats. In particular, the GNU binutils programs ar, ranlib
+  dnl produce libraries that work only with gcc, not with cc.
+  AC_REQUIRE([AC_PROG_CC])
+  AC_EGREP_CPP([Amsterdam],
+    [
+#ifdef __ACK__
+Amsterdam
+#endif
+    ],
+    [AR='cc -c.a'
+     ARFLAGS='-o'
+     RANLIB=':'
+    ],
+    [dnl Use the Automake-documented default values for AR and ARFLAGS.
+     AR='ar'
+     ARFLAGS='cru'
+     dnl Use the ranlib program if it is available.
+     AC_PROG_RANLIB
+    ])
+  AC_SUBST([AR])
+  AC_SUBST([ARFLAGS])
+])
+
 # AC_PROG_MKDIR_P
 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
 # for interoperability with automake-1.9.6 from autoconf-2.62.