+.PHONY: ${subrecipes}
+
+# This will automatically upgrade to latest version at each build
+nixpkgs ?= https://nixos.org/channels/nixos-19.03/nixexprs.tar.xz
+NIX_PATH = nixpkgs=${nixpkgs}:nixpkgsNext=${nixpkgs}:nixpkgsPrevious=${nixpkgs}
+
+nix-path:
+ @echo "export NIX_PATH=$(NIX_PATH)"