diff -r 3ed2d087e70d Modules/_multiprocessing/multiprocessing.c
--- a/Modules/_multiprocessing/multiprocessing.c	Sun Aug 28 18:23:43 2011 +0200
+++ b/Modules/_multiprocessing/multiprocessing.c	Sun Aug 28 18:50:49 2011 +0200
@@ -8,7 +8,7 @@
 
 #include "multiprocessing.h"
 
-#ifdef SCM_RIGHTS
+#if (defined(CMSG_LEN) && defined(SCM_RIGHTS))
     #define HAVE_FD_TRANSFER 1
 #else
     #define HAVE_FD_TRANSFER 0