Help needed building snarl and libsnarl

Dear All

I am having trouble building snarl and libsnarl (see errors below). Perhaps my host system does not meet some expectations of the (lib)snarl build system. I'm using erlang 18.1 and for now attamtping to biuld on MacOS X.9.5.

snarl, master branch, commit d6dfdae

Same error in dev branch but "===> Rebar dependency crypto" line is red.

libsnarl test branch commit 770259b

Same error with make docs

Any pointers very much appreciated. I'd love to use snarl & libsnarl as an RBAC server for my web apps.

With thanks and best wishes

Ivan