anchor.diff:  
     buildInputs = [
       fluxbox # window manager for Lumina DE
  +    hicolor-icon-theme
       libarchive # make `bsdtar` available for lumina-archiver
       numlockx # required for changing state of numlock at login
       qtbase
  
positive.code: , mkDerivation
  , fetchFromGitHub
  , fluxbox
  , libarchive
  , numlockx
  , qmake
  
negative.code:     done
    '';
  
    postInstall = ''
      for theme in lumina-icons material-design-{dark,light}; do
        gtk-update-icon-cache $out/share/icons/$theme
      done
    '';
  
    qmakeFlags = [
      "LINUX_DISTRO=NixOS"
      "CONFIG+=WITH_I18N"
  