diff --git a/run-tests.php b/run-tests.php
index 26ac65b9372..ad784fbc25e 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -59,11 +59,26 @@ NO_PROC_OPEN_ERROR;
 exit;
 }
 
-// __DIR__ is available from 5.3.0
+// Version constants only available as of 5.2.8
+if (!defined("PHP_VERSION_ID")) {
+	list($major, $minor, $bug) = explode(".", phpversion(), 3);
+	$bug = (int)$bug; // Many distros make up their own versions
+	if ($bug < 10) {
+		$bug = "0$bug";
+	}
+
+	define("PHP_VERSION_ID", "{$major}0{$minor}$bug");
+	define("PHP_MAJOR_VERSION", $major);
+}
+
+// __DIR__ and FILE_BINARY is available from 5.3.0
 if (PHP_VERSION_ID < 50300) {
 	define('__DIR__', realpath(dirname(__FILE__)));
+	define('FILE_BINARY', 0);
 }
 
+
+
 // If timezone is not set, use UTC.
 if (ini_get('date.timezone') == '') {
 	date_default_timezone_set('UTC');