sshfs-fuse cannot be cross built from source, because several of its
Python dependencies are not cross-satisfiable. Instead of figuring out
how to make them satisfiable, I found that they were used for testing
and thus could be annotated <!nocheck>. Doing so removes the need to
satisfy them for cross builds. I'm attaching a patch for your
convenience. Once applying it, sshfs-fuse cross builds successfully.

Helmut