RPKI support without SSH transport

Ahoj BIRD Parents - I was wondering if there is a reason, why BIRD 2.0.x can't be built for RPKI support without libssh, although RPKI-RTR would also work on an unencrypted transport (as documented in the BIRD user documentation). I am asking, because I am building BIRD for a hardware router platform (Ubiquiti's EdgeRouters) and including libssh is, although doable, a real pain-in-the-rear, depending on the OS version and hardware architecture (4 variants in the EdgeOS world at the moment). Without libssh, which drags a whole slew of other library-crap behind it 🙄, BIRD is pretty lightweight and very easy to deploy. Just curious ... Thanks a lot (again) for this great piece of software! Clemens