add nix support

default.nix

@@ -0,0 +1,14 @@
+with import <nixpkgs> {};
+stdenv.mkDerivation {
+  name = "env";
+  buildInputs = [
+    (libxslt.override {
+      # added in nixpkgs 11-12-2016
+      cryptoSupport = true;
+    })
+    libxml2
+    wget
+    rsync
+    gnumake
+  ];
+}