Sorry for the spamming, but http://josefsson.org/gss/gss-lsh.html now contain a patch that works with the GSS library in Heimdal and MIT Kerberos 5 too, if you configure with --enable-gss=k5.
My next goal is client mode, but I won't start until people have tried the server part. Meanwhile I'll focus on my own GSS library, which was the reason I got here in the first place. Incidentally, I hardly had to modify it to make it work in LSH, so I'll have to find some better way to test it.