From c8ed8d2efc59212a20fbffad3493f3193b68b20f Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Wed, 23 Mar 2011 23:00:32 -0400
Subject: fail if no lex program is found (i think)

---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 56f08147..b323576f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,6 +3,9 @@ AM_INIT_AUTOMAKE(cdec,0.1)
 AC_CONFIG_HEADERS(config.h)
 AC_PROG_LIBTOOL
 AC_PROG_LEX
+case $LEX in 
+:) AC_MSG_ERROR([No lex (Flex, lex, etc.) program found]);; 
+esac 
 AC_PROG_CC
 AC_PROG_CXX
 AC_LANG_CPLUSPLUS
-- 
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