{}: {
  # Colmena's latest stable version is
  # unusable so get latest unstable version.
  colmena = let
    src = pkgsBuild.fetchFromGitHub {
      owner = "zhaofengli";
      repo = "colmena";
      rev = "47b6414d800c8471e98ca072bc0835345741a56a";
      sha256 = "rINodqeUuezuCWOnpJgrH7u9vJ86fYT+Dj8Mu8T/IBc=";
    };
    flake =
      pkgsBuild.callPackage "${src}/flake.nix" {
      };
  in
    flake.packages."${system}".colmena;

  nixpkgs.config.packageOverrides = pkgs: {
    colmena = pkgs.callPackage
  };
}