Abort configure if lex or flex cannot be found.

git-svn-id: svn://katsu.triplehelix.org/dgamelaunch/trunk@513 db0b04b0-f4d1-0310-9a6d-de3e77497b0e

diff --git a/configure.ac b/configure.ac
index b69abe151f3373092b489cf058810a861a0e86f0..0358165c1b343c8d7613aaaaedf6eb090a4dbf20 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,11 @@ AC_CONFIG_HEADER(config.h)
 
 AC_PROG_CC(cc gcc)
 AC_STDC_HEADERS
+
 AC_PROG_LEX
+if test "x$LEX" != xflex; then
+   AC_MSG_ERROR([lex or flex not found.])
+fi
 
 LIBS="$LIBS $LEXLIB"