change with php test

configure.ac

@@ -57,6 +57,28 @@ case "${gcc_version}" in
 	;;
 esac
 AC_SUBST(GCC_33)
+
+dnl Look for php
+if test "$enable_php" = "yes" ; then
+    dnl We don't want php < 5
+    dnl upstream required SWIGPHP5
+    AC_MSG_CHECKING([for a supported version of php])
+
+    php_version=`${PHP} -v | grep OPcache | sed 's/^.*v/v/' | sed 's/\-.*//'`
+    PHP_5=0
+    case "${php_version}" in
+         4.*)
+    	AC_MSG_RESULT([no (${php_version})])
+    	AC_MSG_ERROR([please use a recent (>= php5) version of php])
+    	;;
+         *)
+    	AC_MSG_RESULT([ok (${php_version})])
+            PHP_5=1
+    	;;
+    esac
+    AC_SUBST(PHP_5)
+   done
+
 AC_SUBST(SHARED)
 VANK_STANDALONE=1
 AC_DEFINE(VANK_STANDALONE, 1, [standalone vank])