check for bison binary, not yacc

this fixes compilation with recent bison

diff --git a/acinclude.m4 b/acinclude.m4
index cea6db87ffd5080a02fd4f5d0bc5decfa36ed038..1684c74a92916ccac91ae943f1dc3d0501def92d 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1842,7 +1842,7 @@ dnl
 dnl Search for bison and check it's version
 dnl
 AC_DEFUN([PHP_PROG_BISON], [
-  AC_PROG_YACC
+  AC_CHECK_PROG(YACC, bison, bison)
   LIBZEND_BISON_CHECK
   PHP_SUBST(YACC)
 ])