Index: Lib/compileall.py
===================================================================
--- Lib/compileall.py	(revision 80457)
+++ Lib/compileall.py	(working copy)
@@ -45,6 +45,8 @@
     names.sort()
     success = 1
     for name in names:
+        if name == '__pycache__':
+            continue
         fullname = os.path.join(dir, name)
         if ddir is not None:
             dfile = os.path.join(ddir, name)