# HG changeset patch
# User Rik <rik@octave.org>
# Date 1344435801 25200
# Node ID 25200c04bc252803461dd82f1410a8a0c3cd857c
# Parent  067699edef865b3635fd6bb845c0a965188291bc
configure.ac: Require makeinfo to be present before building Octave.

* configure.ac: Add new OCTAVE_PROG_MAKEINFO test.

* m4/acinclude.m4: Add new OCTAVE_PROG_MAKEINFO check for presence of makeinfo.

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -2058,6 +2058,7 @@
 OCTAVE_PROG_GPERF
 
 OCTAVE_PROG_GHOSTSCRIPT
+OCTAVE_PROG_MAKEINFO
 OCTAVE_PROG_TEXI2DVI
 OCTAVE_PROG_TEXI2PDF
 
diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -685,6 +685,19 @@
   AC_SUBST(GHOSTSCRIPT)
 ])
 dnl
+dnl Find makeinfo required for reading documentation
+dnl
+dnl OCTAVE_PROG_MAKEINFO
+AC_DEFUN([OCTAVE_PROG_MAKEINFO],
+dnl use MKINFO, not MAKEINFO, for variable name because Automake automatically
+dnl defines a value for MAKEINFO even when it does not exist which will then
+dnl fool the 'test -z' line.
+  [AC_CHECK_PROG(MKINFO, makeinfo, makeinfo, [])
+   if test -z "$MKINFO"; then
+     AC_MSG_ERROR([makeinfo program required for reading documentation])
+   fi
+])
+dnl
 dnl Is texi2dvi installed?
 dnl
 dnl OCTAVE_PROG_TEXI2DVI