From 94c76e5e964aceb7e40fc6a15cf0ce247585c154 Mon Sep 17 00:00:00 2001
From: Peter Kokot <peterkokot@gmail.com>
Date: Sun, 7 Jun 2020 21:53:39 +0200
Subject: [PATCH] Fix #78750: configure assumes yacc and re2c work

---
 build/php.m4 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/build/php.m4 b/build/php.m4
index fdcf8a22dba5e..cee94c0918c45 100644
--- a/build/php.m4
+++ b/build/php.m4
@@ -1783,6 +1783,7 @@ AC_DEFUN([PHP_PROG_BISON], [
     AC_MSG_CHECKING([for bison version])
 
     php_bison_version=$($YACC --version 2> /dev/null | grep 'GNU Bison' | cut -d ' ' -f 4 | tr -d a-z)
+    [ -z "$php_bison_version" ] && php_bison_version=0.0.0
     ac_IFS=$IFS; IFS="."
     set $php_bison_version
     IFS=$ac_IFS
@@ -1846,6 +1847,7 @@ AC_DEFUN([PHP_PROG_RE2C],[
     AC_MSG_CHECKING([for re2c version])
 
     php_re2c_version=$($RE2C --version | cut -d ' ' -f 2 2>/dev/null)
+    [ -z "$php_re2c_version" ] && php_re2c_version=0.0.0
     ac_IFS=$IFS; IFS="."
     set $php_re2c_version
     IFS=$ac_IFS