Build Log: cohttp-lwt-jsoo.2.5.8

Can't find all required versions. Selected: ocaml-base-compiler.5.4.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml&cohttp-lwt-jsoo ocaml-variants ocaml-base-compiler ocaml-base-compiler - cohttp-lwt-jsoo -> (problem) User requested = 2.5.8 No usable implementations: cohttp-lwt-jsoo.6.1.1: Rejected by user-specified constraint cohttp-lwt-jsoo (= 2.5.8) cohttp-lwt-jsoo.5.3.0: Rejected by user-specified constraint cohttp-lwt-jsoo (= 2.5.8) - ocaml -> ocaml.5.2.1 User requested = 5.2.1 - ocaml-compiler -> (problem) ocaml-base-compiler 5.4.0 requires = 5.4.0 Rejected candidates: ocaml-compiler.5.5: Incompatible with restriction: = 5.4.0 ocaml-compiler.5.4.0: Requires ocaml = 5.4.0 ocaml-compiler.5.4.0~rc1: Incompatible with restriction: = 5.4.0 ocaml-compiler.5.4.0~beta2: Incompatible with restriction: = 5.4.0 ocaml-compiler.5.4.0~beta1: Incompatible with restriction: = 5.4.0 ... - ocaml-variants -> (problem) Rejected candidates: ocaml-variants.5.5.0+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler ocaml-variants.5.4.1+trunk: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler ocaml-variants.5.4.0+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler ocaml-variants.5.4.0~rc1+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler ocaml-variants.5.4.0~beta2+options: In same conflict class (ocaml-core-compiler) as ocaml-base-compiler ...