project.nix

let
  rev = "195620b77085a4e746db33894526116f9062086b";
in
  import (builtins.fetchTarball "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz") {
    overlays = [
      (self: super: {
        libaom = self.callPackage ./libaom.nix{  };
        dtrx   = self.callPackage ./dtrx.nix {  };
      })
    ];
  }