post_install() {
  [[ -x /usr/bin/xdg-icon-resource ]] && xdg-icon-resource forceupdate --theme hicolor || \
  ( [[ -x /usr/bin/gtk-update-icon-cache ]] && gtk-update-icon-cache )
}

post_upgrade() {
  post_install
}

post_remove() {
  post_install
}