core/pkgs/by-name/me/meson/packages.nix

{ ... }:
res: pkgs: super:

with pkgs; {
  meson = callPackage ./. { };

  # while building documentation meson may want to run binaries for host
  # which needs an emulator
  # example of an error which this fixes
  # [Errno 8] Exec format error: './gdk3-scan'
  mesonEmulatorHook = makeSetupHook {
    name = "mesonEmulatorHook";
    substitutions = {
      crossFile = writeText "cross-file.conf" ''
        [binaries]
        exe_wrapper = ${
          lib.escapeShellArg (stdenv.targetPlatform.emulator pkgs)
        }
      '';
    };
  }
  # The throw is moved into the `makeSetupHook` derivation, so that its
  # outer level, but not its outPath can still be evaluated if the condition
  # doesn't hold. This ensures that splicing still can work correctly.
    (if (!stdenv.hostPlatform.canExecute stdenv.targetPlatform) then
      ../by-name/me/meson/emulator-hook.sh
    else
      throw
      "mesonEmulatorHook may only be added to nativeBuildInputs when the target binaries can't be executed; however you are attempting to use it in a situation where ${stdenv.hostPlatform.config} can execute ${stdenv.targetPlatform.config}. Consider only adding mesonEmulatorHook according to a conditional based canExecute in your package expression.");
}