{
  lib,
  fetchFromGitHub,
  rustPlatform,
  libcosmicAppHook,
  libdisplay-info,
  libgbm ? null,
  libinput,
  mesa,
  pixman,
  pkg-config,
  seatd,
  stdenv,
  udev,
  xwayland,
  useXWayland ? true,
  systemd,
  useSystemd ? lib.meta.availableOn stdenv.hostPlatform systemd,
  nix-update-script,
}:

rustPlatform.buildRustPackage {
  pname = "cosmic-comp";
  version = "1.0.0-alpha.5-unstable-2025-01-07";

    src = fetchGit {
        url = "https://github.com/phaitonican/cosmic-comp";
        rev = "9c028c17bb8cc4a6f8a8abc40824a5d74bee6818";
        ref = "gtk-border-dev";
    };

  useFetchCargoVendor = true;
  cargoHash = "sha256-P4/Y70vnyIR5JBpHCOhqLlyfan29eNsExkt3ux7joRw=";

  separateDebugInfo = true;

  nativeBuildInputs = [
    libcosmicAppHook
    pkg-config
  ];
  buildInputs = [
    libdisplay-info
    (if libgbm != null then libgbm else mesa)
    libinput
    pixman
    seatd
    udev
  ] ++ lib.optional useSystemd systemd;

  # only default feature is systemd
  buildNoDefaultFeatures = !useSystemd;

  # TODO: remove when <https://github.com/NixOS/nixpkgs/pull/371795> reaches nixos-unstable and nixos-24.11
  postConfigure = ''
    substituteInPlace ../.cargo/config.toml --replace-fail 'branch = "feature%2Fcopy_clone"' 'branch = "feature/copy_clone"'
  '';

  dontCargoInstall = true;

  makeFlags = [
    "prefix=${placeholder "out"}"
    "CARGO_TARGET_DIR=target/${stdenv.hostPlatform.rust.cargoShortTarget}"
  ];

  preFixup = lib.optionalString useXWayland ''
    libcosmicAppWrapperArgs+=(--prefix PATH : ${lib.makeBinPath [ xwayland ]})
  '';

  passthru.updateScript = nix-update-script {
    extraArgs = [
      "--version-regex"
      "epoch-(.*)"
    ];
  };

  meta = with lib; {
    homepage = "https://github.com/pop-os/cosmic-comp";
    description = "Compositor for the COSMIC Desktop Environment";
    license = licenses.gpl3Only;
    maintainers = with maintainers; [
      # lilyinstarlight
    ];
    platforms = platforms.linux;
    mainProgram = "cosmic-comp";
  };
}

In reply to @phaitonican:matrix.org
not sure if this was flake related sorry

Please don't feel bad for asking any questions, I'm just trying to understand why every single message in here is unrelated to the channel.

I'm wondering: What public communication indicates to you that this is related to flakes?

This is not related to pinning any flake input in any flake lockfile.

This is not related about the output forms tod the flake.

This is not related to any of the new commands introduced to work with flakes.

I am not sure what else I'm missing, except for the fact that the flake interface is the only sane mechanism to use nix (the packaging/building language) unless you want to write your own locking script, use someone elses, or edit hashes by hand every time someone makes a new commit somewhere. (or use channels God forbid)