$OpenBSD: patch-src_StatFS_hsc,v 1.1 2011/06/13 21:23:04 kili Exp $
--- src/StatFS.hsc.orig	Sun Mar 27 19:16:24 2011
+++ src/StatFS.hsc	Mon May  2 20:32:56 2011
@@ -23,8 +23,11 @@ import Foreign.C.String
 import Data.ByteString (useAsCString)
 import Data.ByteString.Char8 (pack)
 
-#if defined (__FreeBSD__) || defined (__APPLE__)
+#if (defined(__unix__) || defined(unix)) && !defined(USG)
 # include <sys/param.h>
+#endif
+
+#if defined(BSD4_4)
 # include <sys/mount.h>
 #else
 # include <sys/vfs.h>
@@ -47,7 +50,7 @@ data FileSystemStats = FileSystemStats {
 
 data CStatfs
 
-#if defined (__FreeBSD__) || defined (__APPLE__)
+#if defined(BSD4_4)
 foreign import ccall unsafe "sys/mount.h statfs"
 #else
 foreign import ccall unsafe "sys/vfs.h statfs64"