+     `(#:tests? #f ;; depends on rebar TODO: remove this dependency

I think you meant: ‘TODO: add this dependency here’.
I notice there's a ‘rebar’ package, which is also an implicit
input of rebar5-build-system, so maybe this ‘TODO: ’ has already been
resolved, and #:tests? can be set to #true?

Thanks for pointing on this. Now that rebar3 is packaged, this very package could of course use it. I tried to make it work:

     ;; Running the tests require binary artifact (tar-file containing
     ;; samples git repos)

So I need to keep the tests disabled, just for a different reason :-\

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |