dev-lang/erlang-23.0 removes the "-lerl_interface", which breaks compilation of all rebar-based packages with rebar 2.6.4. We patched this in 2.6.4-r1, as erlang 23.0 recently was stabilized we should stabilize rebar 2.6.4-r1 as well.
x86 stable
amd64 stable
ppc stable
ppc64 stable
sparc stable. Closing.