ocamlPackages.logs: ocamlPackages.logs: refactor to use buildTopkg

pkgs/development/ocaml-modules/logs/default.nix

@@ -3,18 +3,17 @@
   stdenv,
   fetchurl,
   ocaml,
-  findlib,
-  ocamlbuild,
   topkg,
-  result,
-  lwt,
-  cmdliner,
-  fmt,
-  fmtSupport ? lib.versionAtLeast ocaml.version "4.08",
-  js_of_ocaml-compiler,
-  jsooSupport ? true,
-  lwtSupport ? true,
+  buildTopkgPackage,
   cmdlinerSupport ? true,
+  cmdliner,
+  fmtSupport ? lib.versionAtLeast ocaml.version "4.08",
+  fmt,
+  jsooSupport ? true,
+  js_of_ocaml-compiler,
+  lwtSupport ? true,
+  lwt,
+  result,
 }:
 let
   pname = "logs";
@@ -49,25 +48,17 @@ let
   optional_buildInputs = map (d: d.pkg) (lib.filter (d: d.enabled) optional_deps);
 in
 
-if lib.versionOlder ocaml.version "4.03" then
-  throw "logs is not available for OCaml ${ocaml.version}"
-else
-
-  stdenv.mkDerivation rec {
-    name = "ocaml${ocaml.version}-${pname}-${version}";
+buildTopkgPackage rec {
+  inherit pname;
   version = "0.8.0";
 
+  minimalOCamlVersion = "4.03";
+
   src = fetchurl {
     url = "${webpage}/releases/${pname}-${version}.tbz";
     hash = "sha256-mmFRQJX6QvMBIzJiO2yNYF1Ce+qQS2oNF3+OwziCNtg=";
   };
 
-    nativeBuildInputs = [
-      ocaml
-      findlib
-      ocamlbuild
-      topkg
-    ];
   buildInputs = [ topkg ] ++ optional_buildInputs;
   propagatedBuildInputs = [ result ];
 
@@ -75,8 +66,6 @@ else
 
   buildPhase = "${topkg.run} build ${lib.escapeShellArgs enable_flags}";
 
-    inherit (topkg) installPhase;
-
   meta = with lib; {
     description = "Logging infrastructure for OCaml";
     homepage = webpage;
@@ -84,4 +73,4 @@ else
     maintainers = [ maintainers.sternenseemann ];
     license = licenses.isc;
   };
-  }
+}