From: Akim Demaille <akim@lrde.epita.fr>
Date: Tue, 10 Apr 2012 19:36:23 +0000 (+0200)
Subject: build: require Flex.
X-Git-Tag: v2.5.1_rc2~48
X-Git-Url: https://git.saurik.com/bison.git/commitdiff_plain/10232af80816ac644f8b9d6659bf113026672f53

build: require Flex.

* configure.ac: Require Flex.
---

diff --git a/configure.ac b/configure.ac
index 688e18ef..704f5aaa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -114,6 +114,9 @@ AC_SUBST([YACC_LIBRARY])
 
 # Checks for programs.
 AC_PROG_LEX
+if test "$FLEX" != yes; then
+  AC_MSG_ERROR([Flex is required])
+fi
 AC_PROG_YACC
 AC_PROG_RANLIB
 AC_PROG_GNU_M4