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

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

@@ -1,15 +1,16 @@
-{ stdenv, fetchzip, findlib, dune, ocaml, configurator, cppo, lablgtk }:
-stdenv.mkDerivation rec {
-  name = "camlimages-${version}";
+{ stdenv, fetchzip, buildDunePackage, configurator, cppo, lablgtk }:
+
+buildDunePackage rec {
+  pname = "camlimages";
   version = "5.0.0";
+
   src = fetchzip {
-    url = "https://bitbucket.org/camlspotter/camlimages/get/${version}.tar.gz";
+    url = "https://bitbucket.org/camlspotter/${pname}/get/${version}.tar.gz";
     sha256 = "00qvwxkfnhv93yi1iq7vy3p5lxyi9xigxcq464s4ii6bmp32d998";
   };
-  buildInputs = [ findlib dune ocaml configurator cppo lablgtk ];
-  buildPhase = "dune build -p camlimages";
-  inherit (dune) installPhase;
-  
+
+  buildInputs = [ configurator cppo lablgtk ];
+
   meta = with stdenv.lib; {
     branch = "5.0";
     homepage = https://bitbucket.org/camlspotter/camlimages;