anchor.diff:    LC_ALL = "en_US.UTF-8";
   
     postInstall = ''
  -    # zsh completion
  -    install -D misc/__khal $out/share/zsh/site-functions/__khal
  +    # shell completions
  +    installShellCompletion --cmd khal \
  +      --bash <(_KHAL_COMPLETE=bash_source $out/bin/khal) \
  +      --fish <(_KHAL_COMPLETE=zsh_source $out/bin/khal) \
  +      --zsh <(_KHAL_COMPLETE=fish_source $out/bin/khal)
   
       # man page
       PATH="${python3.withPackages (ps: with ps; [ sphinx sphinxcontrib_newsfeed ])}/bin:$PATH" \
  
positive.code:     pkginfo
      freezegun
    ];
    nativeBuildInputs = [ setuptools-scm sphinx sphinxcontrib_newsfeed ];
    checkInputs = [
      glibcLocales
      pytestCheckHook
  
negative.code: 
    doCheck = !stdenv.isAarch64;
  
    meta = with lib; {
      broken = stdenv.isDarwin;
      homepage = "http://lostpackets.de/khal/";
  