From a2c4bd8f094a7247903578860a9c42049991860b Mon Sep 17 00:00:00 2001
From: Richard Marshall <rgm@linux.com>
Date: Mon, 19 Nov 2012 20:20:22 -0800
Subject: Updated configure.in to make sure bison and lex are installed.

Fixes issue #7
---
 configure.in | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/configure.in b/configure.in
index 9a190c2..a06bee1 100644
--- a/configure.in
+++ b/configure.in
@@ -68,7 +68,7 @@ AM_PROG_CC_C_O
 AC_PROG_INSTALL
 AM_PROG_LIBTOOL
 AM_PROG_LEX
-AC_PROG_YACC
+AC_CHECK_PROGS(YACC, 'bison -y')
 
 AC_C_CONST
 AC_C_INLINE
@@ -118,6 +118,19 @@ python/netlink/route/Makefile
 include/netlink/version.h
 ])
 
+ac_errcount=0
+if test -z "$YACC"; then
+    AC_MSG_WARN(bison not found. Please install before continuing.)
+    ac_errcount=$((ac_errcount + 1))
+fi
+if test -z "$LEXLIB"; then
+    AC_MSG_WARN(flex or lex not found. Please install before continuing.)
+    ac_errcount=$((ac_errcount + 1))
+fi
+if test $ac_errcount -gt 0; then
+    AC_MSG_ERROR(Required packages are missing. Please install them and rerun ./configure)
+fi
+
 AC_OUTPUT
 
 echo "-------------------------------------------------------------------------------"
-- 
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