ocaml/opam-repository — pull request #3201 by samoht (2014-12-15 12:55:16+00:00)
Title: camlp4 is a hard dependency of cstruct

See https://github.com/ocaml/opam-repository/commit/3fb653c209287e2b978809d99e09b4a7f31d1e77#commitcomment-8970926