encfs fails to cross build from source, because a try run check fails.
Looking closer this check isn't part of encfs itself part of a vendored
dependency. Looking even closer, the relevant dependency is used for
unit testing. Since we cannot run tests during cross builds, we might as
well skip building tests. Indeed, doing so fixes the cross build. I'm
attaching a patch for your convenience.

I observe that encfs does not run tests during build at all. Still I
consider building the tests a form of testing and thus have not disabled
that.

Helmut