According to Jeffrey Honig, bsd/os 4.0 should be added to the list.
diff --git a/Lib/test/test_fcntl.py b/Lib/test/test_fcntl.py
index f2d4537..10144c3 100755
--- a/Lib/test/test_fcntl.py
+++ b/Lib/test/test_fcntl.py
@@ -16,7 +16,9 @@
if verbose:
print 'Status from fnctl with O_NONBLOCK: ', rv
-if sys.platform in ('netbsd1', 'freebsd2', 'freebsd3', 'bsdos2', 'bsdos3'):
+if sys.platform in ('netbsd1',
+ 'freebsd2', 'freebsd3',
+ 'bsdos2', 'bsdos3', 'bsdos4'):
lockdata = struct.pack('lxxxxlxxxxlhh', 0, 0, 0, FCNTL.F_WRLCK, 0)
elif sys.platform in ['aix3', 'aix4']:
lockdata = struct.pack('hhlllii', FCNTL.F_WRLCK, 0, 0, 0, 0, 0, 0)