From bd9a035d02552d8bb63f1f753222a94c24b4ebcd Mon Sep 17 00:00:00 2001
From: Adam Harvey <aharvey@php.net>
Date: Thu, 17 Oct 2013 15:59:59 -0700
Subject: [PATCH] Respect the $YACC environment variable.

---
 Zend/acinclude.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Zend/acinclude.m4 b/Zend/acinclude.m4
index 77430aba791ea..84e67e1b214c2 100644
--- a/Zend/acinclude.m4
+++ b/Zend/acinclude.m4
@@ -12,7 +12,7 @@ AC_DEFUN([LIBZEND_BISON_CHECK],[
   bison_version=none
   if test "$YACC"; then
     AC_CACHE_CHECK([for bison version], php_cv_bison_version, [
-      bison_version_vars=`bison --version 2> /dev/null | grep 'GNU Bison' | cut -d ' ' -f 4 | $SED -e 's/\./ /' | tr -d a-z`
+      bison_version_vars=`$YACC --version 2> /dev/null | grep 'GNU Bison' | cut -d ' ' -f 4 | $SED -e 's/\./ /' | tr -d a-z`
       php_cv_bison_version=invalid
       if test -n "$bison_version_vars"; then
         set $bison_version_vars