diff -r 6a6b1ee306e3 setup.py
--- a/setup.py	Mon Nov 11 22:11:55 2013 +1000
+++ b/setup.py	Mon Nov 11 10:24:23 2013 -0200
@@ -1476,7 +1476,7 @@
             macros = dict()
             libraries = []
 
-        elif host_platform in ('freebsd4', 'freebsd5', 'freebsd6', 'freebsd7', 'freebsd8'):
+        elif host_platform.startswith('freebsd'):
             # FreeBSD's P1003.1b semaphore support is very experimental
             # and has many known problems. (as of June 2008)
             macros = dict()