--- ./Zend/acinclude.m4	2013-03-20 15:09:27.000000000 +0100
+++ ./Zend/acinclude.m4.new	2013-03-25 21:35:27.654016588 +0100
@@ -17,12 +17,7 @@
       if test -n "$bison_version_vars"; then
         set $bison_version_vars
         bison_version="${1}.${2}"
-        for bison_check_version in $bison_version_list; do
-          if test "$bison_version" = "$bison_check_version"; then
-            php_cv_bison_version="$bison_check_version (ok)"
-            break
-          fi
-        done
+        php_cv_bison_version="$bison_version (ok)"
       fi
     ])
   fi