Merge recent master into staging

Hydra nixpkgs: ?compare=1151601

pkgs/development/libraries/gecode/default.nix

@@ -0,0 +1,21 @@
+{ stdenv, fetchurl, perl }:
+
+stdenv.mkDerivation rec {
+  name = "gecode-${version}";
+  version = "4.3.0";
+
+  src = fetchurl {
+    url = "http://www.gecode.org/download/${name}.tar.gz";
+    sha256 = "18a1nd6sxqqh05hd9zwcgq9qhqrr6hi0nbzpwpay1flkv5gvg2d7";
+  };
+
+  buildInputs = [ perl ];
+
+  meta = with stdenv.lib; {
+    license = licenses.mit;
+    homepage = http://www.gecode.org;
+    description = "Toolkit for developing constraint-based systems";
+    platforms = platforms.all;
+    maintainers = [ maintainers.manveru ];
+  };
+}