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From: Adrian Chadd <adrian@freebsd.org>
To: Arnaud Lacombe <lacombar@gmail.com>
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Cc: freebsd-net@freebsd.org, "K. Macy" <kmacy@freebsd.org>
Subject: Re: No IPFW binary compat across versions ?
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That's not what the COMPAT_* hooks are for.

They're for backwards compatibility of normal userland binaries, not
binaries which use a FreeBSD-specific kernel ABI.
Adrian