FAILED (no external dependency "gstreamer-1.0.pc") opam => [build gstreamer.0.2.0 OCamlPro/opam-repository:master with 4.02.0 on Linux (x86_64)]

/github/OCamlPro/opam-repository/task/875
FAILED (unsatisfied dependency "ocamlnet.3.6.0") opam => [build netamqp.1.0 OCamlPro/opam-repository:master with 4.02.0 on Linux (x86_64)]

/github/OCamlPro/opam-repository/task/887