Stop configure if there is no makeinfo

	* m4/sxe-bldchain-progs.m4 (SXE_PROG_MAKEINFO): Detection of
	makeinfo. Since autoconf will actually define one using missing,
	we kinda need to execute --version to make sure it is actually
	real.

	* m4/sxe-bldchain-progs.m4 (SXE_CHECK_BUILDCHAIN): Add call to
	SXE_PROG_MAKEINFO

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>

diff --git a/m4/sxe-bldchain-progs.m4 b/m4/sxe-bldchain-progs.m4
index 6bdca66..c7f9cdb 100644 (file)
--- a/m4/sxe-bldchain-progs.m4
+++ b/m4/sxe-bldchain-progs.m4
@@ -1,5 +1,24 @@
 dnl sxe-bldchain-progs.m4 -- Necessary build chain stuff
 
+AC_DEFUN([SXE_PROG_MAKEINFO], [dnl
+       AC_ARG_VAR([MAKEINFO], [the makeinfo command])
+       AC_CHECK_TOOL([MAKEINFO], [makeinfo], [:], [$PATH])
+       eval "$MAKEINFO --version > /dev/null 2>&1"
+       if  test $? != 0; then
+               if echo $MAKEINFO | grep -q "missing --run"; then
+                       # libtool missing has a much nicer error message
+                       $MAKEINFO
+               fi
+               # This should be a good enough error message even in complement
+               # to the libtool missing
+               AC_MSG_ERROR([
+Could not find the makeinfo program. Check your PATH or install the texinfo package. 
+For more details see the INSTALL and PROBLEMS files.
+SXEmacs generates the documentation during the build process.])
+               exit 1
+       fi
+       AC_SUBST(MAKEINFO)
+])dnl SXE_PROG_MAKEINFO
 
 
 AC_DEFUN([SXE_PROG_AR], [dnl
@@ -103,6 +122,7 @@ dnl         dnl Soon ...
 dnl    dnl m4_ifdef([LT_INIT], [LT_INIT], [AC_PROG_LIBTOOL])
        AC_PROG_RANLIB
        SXE_PROG_AR
+       SXE_PROG_MAKEINFO
 ])dnl SXE_CHECK_BUILDCHAIN
 
 dnl recommended interface macro for parser/lexer