ocamlPackages.jsont: flags to turn off optional dependencies

{

  lib,

  fetchzip,

  topkg,

  buildTopkgPackage,

  withBrr ? true,

  brr,

  withBytesrw ? true,

  bytesrw,

  withCmdliner ? true,

  cmdliner,

}:

    hash = "sha256-dXHl+bLuIrlrQ5Np37+uVuETFBb3j8XeDVEK9izoQFk=";

  };

  # docs say these dependendencies are optional, but buildTopkgPackage doesn’t

  # handle missing dependencies

  buildInputs = lib.optional withCmdliner cmdliner;

  buildInputs = [

    cmdliner

  ];

  propagatedBuildInputs = lib.optional withBrr brr ++ lib.optional withBytesrw bytesrw;

  propagatedBuildInputs = [

    brr

    bytesrw

  ];

  buildPhase = "${topkg.run} build ${

    lib.escapeShellArgs [

      "--with-brr"

      (lib.boolToString withBrr)

      "--with-bytesrw"

      (lib.boolToString withBytesrw)

      "--with-cmdliner"

      (lib.boolToString withCmdliner)

    ]

  }";

  meta = {

    description = "Declarative JSON data manipulation";