diff -r 1064a296a2a7 -r 39d36c2db68e contrib/python-zstandard/zstd.c
--- a/contrib/python-zstandard/zstd.c	Wed Mar 08 09:03:42 2017 -0500
+++ b/contrib/python-zstandard/zstd.c	Sat Apr 08 14:33:20 2017 -0700
@@ -11,6 +11,9 @@
 #if defined(_WIN32)
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
+#elif defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
 #endif
 
 #include "python-zstandard.h"