--- /dev/null
+#!/bin/bash
+
+# This will automatically upgrade to latest version at each build
+# nixpkgs="https://nixos.org/channels/nixos-19.03/nixexprs.tar.xz"
+nixpkgs="https://releases.nixos.org/nixos/19.03/nixos-19.03beta171931.3a4ffdd38b5/nixexprs.tar.xz"
+nixpkgsPrevious="$nixpkgs"
+nixpkgsNext="$nixpkgs"
+export NIX_PATH="nixpkgs=$nixpkgs:nixpkgsNext=$nixpkgsNext:nixpkgsPrevious=$nixpkgsPrevious"
+