diff --git a/pkgs/development/interpreters/clojure/default.nix b/pkgs/development/interpreters/clojure/default.nix
index 6c20ca71406..dbbe4a9dcc3 100644
--- a/pkgs/development/interpreters/clojure/default.nix
+++ b/pkgs/development/interpreters/clojure/default.nix
@@ -1,17 +1,22 @@
-{stdenv, fetchurl, unzip, ant}:
+{stdenv, fetchurl, unzip, ant, version ? "1.4.0" }:
 
-stdenv.mkDerivation rec {
-  version = "1.4.0";
+let 
+  src_hashes = {
+    "1.4.0" = "27a5a151d5cc1bc3e52dff47c66111e637fefeb42d9bedfa1284a1a31d080171";
+    "1.5.0-RC1" = "111jm0nxkvqr1vrwcpvr70v5paasp8msrj5h8zm1c144c8zc1vln";
+  };
+in 
+stdenv.mkDerivation {
   name = "clojure-${version}";
 
   src = fetchurl {
     url = "http://repo1.maven.org/maven2/org/clojure/clojure/${version}/clojure-${version}.zip";
-    sha256 = "27a5a151d5cc1bc3e52dff47c66111e637fefeb42d9bedfa1284a1a31d080171";
+    sha256 = (builtins.getAttr version src_hashes); 
   };
 
   buildInputs = [ unzip ant ];
 
-  buildPhase = "ant";
+  buildPhase = "ant jar";
 
   installPhase = "
     mkdir -p $out/lib/java
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3b7610f0313..4fda63dc035 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2762,6 +2762,8 @@ let
 
   clojure = callPackage ../development/interpreters/clojure { };
 
+  clojureUnstable = callPackage ../development/interpreters/clojure { version = "1.5.0-RC1"; };
+
   clojure_binary = callPackage ../development/interpreters/clojure/binary.nix { };
 
   clojure_wrapper = callPackage ../development/interpreters/clojure/wrapper.nix {