/usr/lib/liberl_interface_st.a is in erlang-dev 1:17.3-dfsg-4+deb8u2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/erlang/usr/lib/liberl_interface_st.a
/usr/lib/erlang/usr/lib/liberl_interface_st.a