1 files changed, 20 insertions, 5 deletions
diff --git a/pkgs/development/ocaml-modules/ocsigen-deriving/default.nix b/pkgs/development/ocaml-modules/ocsigen-deriving/default.nix
index 653445617958..569f5081355c 100644
--- a/pkgs/development/ocaml-modules/ocsigen-deriving/default.nix
+++ b/pkgs/development/ocaml-modules/ocsigen-deriving/default.nix
@@ -1,15 +1,30 @@
-{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, oasis, ocaml_optcomp, camlp4 }:
+{ stdenv, fetchzip, ocaml, findlib, ocamlbuild, oasis, ocaml_optcomp, camlp4
+, num
+}:
 
-let version = "0.7.1"; in
+let param =
+  if stdenv.lib.versionAtLeast ocaml.version "4.03"
+  then {
+    version = "0.8.1";
+    sha256 = "03vzrybdpjydbpil97zmir71kpsn2yxkjnzysma7fvybk8ll4zh9";
+    buildInputs = [ num ];
+  } else {
+    version = "0.7.1";
+    sha256 = "0gg3nr3iic4rwqrcc0qvfm9x0x57zclvdsnpy0z8rv2fl5isbzms";
+  };
+in
+
+let inherit (param) version; in
 
 stdenv.mkDerivation {
   name = "ocsigen-deriving-${version}";
   src = fetchzip {
     url = "https://github.com/ocsigen/deriving/archive/${version}.tar.gz";
-    sha256 = "0gg3nr3iic4rwqrcc0qvfm9x0x57zclvdsnpy0z8rv2fl5isbzms";
-    };
+    inherit (param) sha256;
+  };
 
-  buildInputs = [ ocaml findlib ocamlbuild oasis ocaml_optcomp camlp4 ];
+  buildInputs = [ ocaml findlib ocamlbuild oasis ocaml_optcomp camlp4 ]
+  ++ (param.buildInputs or []);
 
   createFindlibDestdir = true;