post_install() {
  [[ $(type -p gtk-update-icon-cache) ]] && usr/bin/gtk-update-icon-cache -qtf usr/share/icons/hicolor
  [[ $(type -p update-desktop-database) ]] && usr/bin/update-desktop-database -q usr/share/applications
  true
}

post_upgrade() {
  post_install $1
  true
}

post_remove() {
  post_install $1
  true
}