--- imageapi_gd.original.install	Tue Mar 10 23:42:47 2009
+++ imageapi_gd.install	Fri May  1 22:17:42 2009
@@ -57,9 +57,10 @@ function imageapi_gd_requirements($phase
       );
     }
 
+    // Test PHP memory_limit
     $memory_limit = ini_get('memory_limit');
-    
-    if (parse_size($memory_limit) < parse_size('96M')) {
+
+    if ($memory_limit && $memory_limit != -1 && parse_size($memory_limit) < parse_size('96M')) {
       $requirements['imagecache_memory_limit'] = array(
         'title' => $t('ImageAPI GD Memory Limit'),
         'value' => $memory_limit,