Add rebar3 package

pkgs/development/tools/build-managers/rebar3/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, fetchurl, erlang }:
+
+
+let
+  version = "3.0.0-beta.4";
+in
+stdenv.mkDerivation {
+  name = "rebar3-${version}";
+
+  src = fetchurl {
+    url = "https://github.com/rebar/rebar3/archive/${version}.tar.gz";
+    sha256 = "0px66scjdia9aaa5z36qzxb848r56m0k98g0bxw065a2narsh4xy";
+  };
+
+  buildInputs = [ erlang ];
+
+  buildPhase = ''
+    HOME=. escript bootstrap
+  '';
+  installPhase = ''
+    mkdir -p $out/bin
+    cp rebar3 $out/bin/rebar3
+  '';
+
+  meta = {
+    homepage = "https://github.com/rebar/rebar3";
+    description = "rebar 3.0 is an Erlang build tool that makes it easy to compile and test Erlang applications, port drivers and releases.";
+
+    longDescription = ''
+      rebar is a self-contained Erlang script, so it's easy to distribute or
+      even embed directly in a project. Where possible, rebar uses standard
+      Erlang/OTP conventions for project structures, thus minimizing the amount
+      of build configuration work. rebar also provides dependency management,
+      enabling application writers to easily re-use common libraries from a
+      variety of locations (hex.pm, git, hg, and so on).
+      '';
+
+    platforms = stdenv.lib.platforms.unix;
+    maintainers = [ stdenv.lib.maintainers.gleber ];
+  };
+}