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

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

@@ -1,32 +1,25 @@
-{ stdenv, fetchFromGitHub, ocaml, findlib, dune, alcotest }:
+{ stdenv, fetchFromGitHub, buildDunePackage, alcotest }:
 
-if !stdenv.lib.versionAtLeast ocaml.version "4.03"
-then throw "bigstringaf is not available for OCaml ${ocaml.version}"
-else
-
-stdenv.mkDerivation rec {
+buildDunePackage rec {
+  pname = "bigstringaf";
   version = "0.3.0";
-  name = "ocaml${ocaml.version}-bigstringaf-${version}";
+
+  minimumOCamlVersion = "4.03";
 
   src = fetchFromGitHub {
     owner = "inhabitedtype";
-    repo = "bigstringaf";
+    repo = pname;
     rev = version;
     sha256 = "1yx6hv8rk0ldz1h6kk00rwg8abpfc376z00aifl9f5rn7xavpscs";
   };
 
-  buildInputs = [ ocaml findlib dune alcotest ];
-
+  buildInputs = [ alcotest ];
   doCheck = true;
-  checkPhase = "dune runtest";
-
-  inherit (dune) installPhase;
 
   meta = {
     description = "Bigstring intrinsics and fast blits based on memcpy/memmove";
     license = stdenv.lib.licenses.bsd3;
     maintainers = [ stdenv.lib.maintainers.vbgl ];
     inherit (src.meta) homepage;
-    inherit (ocaml.meta) platforms;
   };
 }