Issue #4028: Make multiprocessing build on SunOS.

diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c
index 83df1eb7503a1bd07a3ad27542dc886a5473dbe6..ee250e00439a05f5eda44a20bade590b4ad2e2b6 100644 (file)
--- a/Modules/_multiprocessing/multiprocessing.c
+++ b/Modules/_multiprocessing/multiprocessing.c
@@ -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