From 0b419a4d47e7e67837eba4c6b9d52ef664938f9d Mon Sep 17 00:00:00 2001
From: Alex Merry <dev@randomguy3.me.uk>
Date: Sat, 3 Aug 2013 10:37:06 +0100
Subject: Demand actual bison and flex, rather than yacc and lex

We use bison/flex extensions, so we need those actual tools.
---
 tikzit/configure.ac | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'tikzit/configure.ac')

diff --git a/tikzit/configure.ac b/tikzit/configure.ac
index 8f791b6..99697c5 100644
--- a/tikzit/configure.ac
+++ b/tikzit/configure.ac
@@ -21,8 +21,19 @@ AC_PROG_OBJC([gcc clang objc objcc])
 AC_LANG([Objective C])
 
 AC_PROG_LEX
-AM_PROG_LEX
+AS_IF([$LEX --version 2>/dev/null | grep "^flex" >/dev/null 2>/dev/null],[],
+  [
+    AC_MSG_WARN([flex not found; this may cause problems for developers])
+    LEX="\${SHELL} \$(top_srcdir)/missing flex"
+    AC_SUBST([LEX_OUTPUT_ROOT], [lex.yy])
+    AC_SUBST([LEXLIB], [''])
+  ])
 AC_PROG_YACC
+AS_IF([$YACC --version 2>/dev/null | grep "^bison" >/dev/null 2>/dev/null],[],
+  [
+    AC_MSG_WARN([bison not found; this may cause problems for developers])
+    YACC="\${SHELL} \$(top_srcdir)/missing bison"
+  ])
 
 # Checks for libraries.
 FOUNDATION_OBJCFLAGS=`eval "gnustep-config --objc-flags"`
-- 
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