/usr/lib/liberl_interface.a is in erlang-dev 1:15.b.1-dfsg-4+deb7u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/erlang/lib/erl_interface-3.7.7/lib/liberl_interface.a
/usr/lib/erlang/lib/erl_interface-3.7.7/lib/liberl_interface.a