Package elixir and rebar.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>

pkgs/development/interpreters/elixir/default.nix

@@ -0,0 +1,20 @@
+{ stdenv, fetchurl, erlang, rebar }:
+
+stdenv.mkDerivation {
+  name = "elixir-0.10.1";
+
+  src = fetchurl {
+    url = "https://github.com/elixir-lang/elixir/archive/v0.10.1.tar.gz";
+    sha256 = "0gfr2bz3mw7ag9z2wb2g22n2vlyrp8dwy78fj9zi52kzl5w3vc3w";
+  };
+
+  buildInputs = [ erlang rebar ];
+
+  preBuild = ''
+    substituteInPlace rebar \
+      --replace "/usr/bin/env escript" ${erlang}/bin/escript
+    substituteInPlace Makefile \
+      --replace '$(shell echo `pwd`/rebar)' ${rebar}/bin/rebar \
+      --replace "/usr/local" $out
+  '';
+}