unix-errno 0.6.1: require ctypes >= 0.12.0
unix-errno 0.6.1: require ctypes >= 0.12.0

ctypes started using integers at 0.12.0, lower versions may have conflicting modules for Signed
emillon/opam-repository,kkirstein/opam-repository,codinuum/opam-repository,andersfugmann/opam-repository,hannesm/opam-repository,codinuum/opam-repository,djs55/opam-repository,emillon/opam-repository,djs55/opam-repository,pqwy/opam-repository,nberth/opam-repository,pirbo/opam-repository,c-cube/opam-repository,yallop/opam-repository,yallop/opam-repository,jhwoodyatt/opam-repository,mjambon/opam-repository,Chris00/opam-repository,Chris00/opam-repository,fpottier/opam-repository,astrada/opam-repository,kkirstein/opam-repository,astrada/opam-repository,nberth/opam-repository,jhwoodyatt/opam-repository,andersfugmann/opam-repository,toots/opam-repository,Leonidas-from-XIV/opam-repository,pirbo/opam-repository,mjambon/opam-repository,hannesm/opam-repository,pqwy/opam-repository,ocaml/opam-repository,toots/opam-repository,c-cube/opam-repository,ocaml/opam-repository,fpottier/opam-repository,Leonidas-from-XIV/opam-repository