{ ... }:

{
  nixpkgs = {
    overlays = [
      #(self: super: {
      #  kitty = super.kitty.overrideAttrs (old: {
      #    preCheck = ''
      #      # skip failing tests due to darwin sandbox
      #      substituteInPlace kitty_tests/file_transmission.py \
      #        --replace test_file_get dont_test_file_get \
      #        --replace test_path_mapping_receive dont_test_path_mapping_receive \
      #        --replace test_transfer_send dont_test_transfer_send
      #      substituteInPlace kitty_tests/shell_integration.py \
      #        --replace test_fish_integration dont_test_fish_integration
      #      substituteInPlace kitty_tests/shell_integration.py \
      #        --replace test_bash_integration dont_test_bash_integration
      #      substituteInPlace kitty_tests/open_actions.py \
      #        --replace test_parsing_of_open_actions dont_test_parsing_of_open_actions
      #      substituteInPlace kitty_tests/ssh.py \
      #        --replace test_ssh_connection_data dont_test_ssh_connection_data
      #      substituteInPlace kitty_tests/fonts.py \
      #        --replace 'class Rendering(BaseTest)' 'class Rendering'

      #      # TODO(emile): figure out why this test is failing and activate it
      #      # again.
      #      substituteInPlace kittens/hyperlinked_grep/main_test.go \
      #        --replace TestRgArgParsing DontTestRgArgParsing \

      #      # theme collection test starts an http server
      #      rm tools/themes/collection_test.go
      #      # passwd_test tries to exec /usr/bin/dscl
      #      rm tools/utils/passwd_test.go
      #    '';
      #  });
      #})
    ];
    config = {
      allowUnfree = true;
      allowBroken = true;
    };
  };
}