ocamlPackages.xmlm: 1.2.0 -> 1.3.0

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

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, opam }:
+{ stdenv, fetchurl, ocaml, findlib, ocamlbuild, opam, topkg }:
 let
   pname = "xmlm";
   webpage = "http://erratique.ch/software/${pname}";
@@ -6,22 +6,37 @@ in
 
 assert stdenv.lib.versionAtLeast ocaml.version "3.12";
 
+let param =
+  if stdenv.lib.versionAtLeast ocaml.version "4.02"
+  then {
+    version = "1.3.0";
+    sha256 = "1rrdxg5kh9zaqmgapy9bhdqyxbbvxxib3bdfg1vhw4rrkp1z0x8n";
+    buildInputs = [ topkg ];
+    inherit (topkg) buildPhase;
+  } else {
+    version = "1.2.0";
+    sha256 = "1jywcrwn5z3gkgvicr004cxmdaqfmq8wh72f81jqz56iyn5024nh";
+    buildInputs = [];
+    buildPhase = "./pkg/build true";
+  };
+in
+
 stdenv.mkDerivation rec {
   name = "ocaml-${pname}-${version}";
-  version = "1.2.0";
+  inherit (param) version;
 
   src = fetchurl {
     url = "${webpage}/releases/${pname}-${version}.tbz";
-    sha256 = "1jywcrwn5z3gkgvicr004cxmdaqfmq8wh72f81jqz56iyn5024nh";
+    inherit (param) sha256;
   };
 
-  buildInputs = [ ocaml findlib ocamlbuild opam ];
+  buildInputs = [ ocaml findlib ocamlbuild opam ] ++ param.buildInputs;
 
   createFindlibDestdir = true;
 
   unpackCmd = "tar xjf $src";
 
-  buildPhase = "./pkg/build true";
+  inherit (param) buildPhase;
 
   installPhase = ''
     opam-installer --script --prefix=$out ${pname}.install > install.sh