diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/Makefile.conf.diff b/pkgs/development/tools/ocaml/js_of_ocaml/Makefile.conf.diff
index ee39855fec9..e6fc96038ff 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/Makefile.conf.diff
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/Makefile.conf.diff
@@ -3,7 +3,7 @@
 @@ -1,6 +1,6 @@
  
  # Where binaries are installed:
--BINDIR := /usr/local/bin
+-BINDIR := `dirname  \`which ocamlc\``
 +BINDIR := $(out)/bin
  
  ####
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/default.nix b/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
index a7167d0c226..10f00c4e542 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/default.nix
@@ -1,13 +1,15 @@
-{stdenv, fetchurl, ocaml, findlib, ocaml_lwt, menhir, ocsigen_deriving}:
+{stdenv, fetchurl, ocaml, findlib, ocaml_lwt, menhir, ocsigen_deriving, camlp4,
+ cmdliner}:
 
 stdenv.mkDerivation {
   name = "js_of_ocaml";
   src = fetchurl {
-    url = https://github.com/ocsigen/js_of_ocaml/archive/2.2.tar.gz;
-    sha256 = "1cp81gpvyxgvzxg0vzyl8aa2zvcixp6m433w8zjifrg6vb7lhp97";
+    url = https://github.com/ocsigen/js_of_ocaml/archive/2.5.tar.gz;
+    sha256 = "1prm08nf8szmd3p13ysb0yx1cy6lr671bnwsp25iny8hfbs39sjv";
     };
   
-  buildInputs = [ocaml findlib ocaml_lwt menhir ocsigen_deriving];
+  buildInputs = [ocaml findlib ocaml_lwt menhir ocsigen_deriving
+                 cmdliner camlp4];
 
   patches = [ ./Makefile.conf.diff ];