Add support for FreeBSD 6.
diff --git a/setup.py b/setup.py
index 873a333..c309a32 100644
--- a/setup.py
+++ b/setup.py
@@ -782,7 +782,7 @@
             # Linux-specific modules
             exts.append( Extension('linuxaudiodev', ['linuxaudiodev.c']) )
 
-        if platform in ('linux2', 'freebsd4', 'freebsd5'):
+        if platform in ('linux2', 'freebsd4', 'freebsd5', 'freebsd6'):
             exts.append( Extension('ossaudiodev', ['ossaudiodev.c']) )
 
         if platform == 'sunos5':