From 10232af80816ac644f8b9d6659bf113026672f53 Mon Sep 17 00:00:00 2001
From: Akim Demaille <akim@lrde.epita.fr>
Date: Tue, 10 Apr 2012 21:36:23 +0200
Subject: [PATCH] build: require Flex.

* configure.ac: Require Flex.
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

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
-- 
2.50.0