ocsigen/lwt — pull request #2 by avsm (2013-08-03 20:32:20+00:00)
Title: OCaml 4.01.0dev has a Unix.O_CLOEXEC flag, so add this to Lwt_unix too.

This was added quite recently in ocaml/ocaml@2207c45056e69d1ea5 and the build is broken on 4.01 without it.