Actually ocicat, the -w flag wasn't always implicit as it is now.. traditionally the argument was needed to indicate "write".
It's still supported by the program, but it's a no-op now.. as mentioned in the source, it's retained for compatibility.
I confirmed that it works here on OpenBSD 4.7/i386, the problem is possibly related to the user using OpenBSD/amd64, where machdep.userldt is indeed invalid and unnecessary.
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