final: prev: {
  element-web = prev.element-web.overrideAttrs (old: {
    preInstall = ''
      bundlecss=$(find . -name 'bundle.css')
      cat ${./user.css} >> $bundlecss
      bundlejs=$(find . -name 'vendors~init.js')
      sed -i 's/return n.room.roomId===e||n.isUnread}/return n.room.roomId===e||n.hasUnreadCount}/' $bundlejs
      cp ${./orville_communicator.opus} webapp/media/message.ogg
    '';
  });
}