diff -ru -x '*~' Python-2.7.1-orig//Python/import.c Python-2.7.1//Python/import.c
--- Python-2.7.1-orig//Python/import.c	2010-05-20 20:37:55.000000000 +0200
+++ Python-2.7.1//Python/import.c	2011-01-04 15:55:11.000000000 +0100
@@ -751,7 +751,7 @@
         return NULL;
     }
     pyc_mtime = PyMarshal_ReadLongFromFile(fp);
-    if (pyc_mtime != mtime) {
+    if (pyc_mtime != mtime && mtime != 1) {
         if (Py_VerboseFlag)
             PySys_WriteStderr("# %s has bad mtime\n", cpathname);
         fclose(fp);