--- aclocal.m4 2002/03/14 15:29:23 1.11
+++ aclocal.m4 2002/07/25 07:54:51 1.12
@@ -336,3 +336,72 @@
fi
])
+dnl ##
+dnl ## Check for GNU Bison and GNU Flex
+dnl ##
+dnl ## configure.in:
+dnl ## AC_CHECK_BISON(BISON, 1.30, [1.3[0-9]|1.[4-9]])
+dnl ## AC_CHECK_FLEX(FLEX, 2.5.6, [2.5.[6-9]|2.5.1[0-9]|2.[6-9].*])
+dnl ##
+dnl ## Makefile.in:
+dnl ## BISON = @BISON@
+dnl ## FLEX = @FLEX@
+dnl ##
+
+AC_DEFUN(AC_CHECK_BISON,[dnl
+if test ".$enable_maintainer" = .yes; then
+ bison_version=""
+ for prog in bison bison-beta bison-alpha bison-snap; do
+ AC_PATH_PROG($1, $prog, NA)
+ if test ".$$1" != .NA; then
+ bison_version=`($$1 --version | head -1 | sed -e 's;^[[^0-9]]*\([[0-9]][[0-9.]]*\).*;\1;') 2>/dev/null`
+ case "$bison_version" in
+ $3 ) break ;;
+ * ) $1="NA"; unset ac_cv_path_$1 ;;
+ esac
+ else
+ unset ac_cv_path_$1
+ fi
+ done
+ if test ".$$1" = .NA; then
+ if test ".$bison_version" != .; then
+ AC_ERROR([found GNU Bison version $bison_version; require version >= $2])
+ else
+ AC_ERROR([require GNU Bison version >= $2])
+ fi
+ fi
+else
+ dnl # disable the use of the tools, but still allow manual override
+ test ".$$1" = . && $1=true
+ AC_PATH_PROG($1, bison, true)
+fi
+])
+
+AC_DEFUN(AC_CHECK_FLEX,[dnl
+if test ".$enable_maintainer" = .yes; then
+ flex_version=""
+ for prog in flex flex-beta flex-alpha flex-snap; do
+ AC_PATH_PROG($1, $prog, NA)
+ if test ".$$1" != .NA; then
+ flex_version=`($$1 --version | head -1 | sed -e 's;^[[^0-9]]*\([[0-9]][[0-9.]]*\).*;\1;') 2>/dev/null`
+ case "$flex_version" in
+ $3 ) break ;;
+ * ) $1="NA"; unset ac_cv_path_$1 ;;
+ esac
+ else
+ unset ac_cv_path_$1
+ fi
+ done
+ if test ".$$1" = .NA; then
+ if test ".$flex_version" != .; then
+ AC_ERROR([found GNU Flex version $flex_version; require version >= $2])
+ else
+ AC_ERROR([require GNU Flex version >= $2])
+ fi
+ fi
+else
+ test ".$$1" = . && $1=true
+ AC_PATH_PROG($1, flex, true)
+fi
+])
+
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