ocaml/opam-repository — pull request #2513 by planar (2014-08-27 12:20:21+00:00)
Title: fix dependencies of "bson"

'opam install bson' works, but 'opam install js_of_ocaml bson' fails because 'deriving' is needed when 'js_of_ocaml' is present, but both are listed as optional dependencies.

Solution: move 'deriving' from the list of optional to strong dependencies.