Build Log: qcow.0.12.2

Can't find all required versions. Selected: angstrom.0.16.1 asetmap.0.8.1 astring.0.8.5 base.v0.17.3 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 conf-linux-libc-dev.0 conf-pkg-config.4 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 cstruct-lwt.6.2.0 diet.0.4 dune.3.20.2 dune-configurator.3.20.2 duration.0.2.1 fmt.0.11.0 io-page.3.0.0 logs.0.10.0 lwt.5.9.2 mirage-block.3.0.2 mirage-block-combinators.3.0.2 mirage-block-unix.2.14.2 mirage-sleep.4.1.0 num.1.6 ocaml-base-compiler.5.4.0 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 parsexp.v0.17.0 ppx_derivers.1.2.1 ppx_deriving.6.1.1 ppx_sexp_conv.v0.17.1 ppxlib.0.37.0 ppxlib_jane.v0.17.4 prometheus.1.2 qcow-types.0.12.2 re.1.14.0 result.1.5 rresult.0.7.0 sexplib.v0.17.0 sexplib0.v0.17.0 sha.1.15.4 stdlib-shims.0.3.0 stringext.1.6.0 topkg.1.1.1 uri.4.4.0 ocaml&qcow ocaml-base-compiler ocaml-base-compiler system-mingw system-mingw|system-msvc&winpthreads ocaml base-domains ocaml-variants ocaml-base-compiler - ocaml -> ocaml.5.4.0 User requested = 5.4.0 - ocaml-compiler -> ocaml-compiler.5.4.0 ocaml-base-compiler 5.4.0 requires = 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 ... - qcow -> qcow.0.12.2 User requested = 0.12.2 - system-mingw -> (problem) No known implementations at all - unix-type-representations -> (problem) Rejected candidates: unix-type-representations.0.1.2: Requires ocaml < 5.0.0 unix-type-representations.0.1.1: Requires ocaml < 5.0.0 unix-type-representations.0.1.0: Requires ocaml < 5.0.0