buildDunePackage: new support function; use it to refactor some OCaml derivations

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

@@ -1,33 +1,24 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, dune, lwt }:
+{ stdenv, fetchFromGitHub, buildDunePackage, lwt }:
 
-if !stdenv.lib.versionAtLeast ocaml.version "4.02"
-then throw "lwt_log is not available for OCaml ${ocaml.version}"
-else
-
-stdenv.mkDerivation rec {
+buildDunePackage rec {
+  pname = "lwt_log";
   version = "1.1.0";
-  name = "ocaml${ocaml.version}-lwt_log-${version}";
+
+  minimumOCamlVersion = "4.02";
 
   src = fetchFromGitHub {
     owner = "aantron";
-    repo = "lwt_log";
+    repo = pname;
     rev = version;
     sha256 = "1c58gkqfvyf2j11jwj2nh4iq999wj9xpnmr80hz9d0nk9fv333pi";
   };
 
-  buildInputs = [ ocaml findlib dune ];
-
   propagatedBuildInputs = [ lwt ];
 
-  buildPhase = "dune build -p lwt_log";
-
-  inherit (dune) installPhase;
-
   meta = {
     description = "Lwt logging library (deprecated)";
     homepage = "https://github.com/aantron/lwt_log";
     license = stdenv.lib.licenses.lgpl21;
-    inherit (ocaml.meta) platforms;
     maintainers = [ stdenv.lib.maintainers.vbgl ];
   };
 }