Add reminder that ossaudiodev can/should also be built on FreeBSD.
diff --git a/setup.py b/setup.py
index a0e931c..849438c 100644
--- a/setup.py
+++ b/setup.py
@@ -722,6 +722,8 @@
         if platform == 'linux2':
             # Linux-specific modules
             exts.append( Extension('linuxaudiodev', ['linuxaudiodev.c']) )
+
+            # XXX should also build this on FreeBSD!
             exts.append( Extension('ossaudiodev', ['ossaudiodev.c']) )
 
         if platform == 'sunos5':