meson/docs/markdown/snippets/gnome_install_script.md

gnome.post_install()

Post-install update of various system wide caches. Each script will be executed only once even if gnome.post_install() is called multiple times from multiple subprojects. If DESTDIR is specified during installation all scripts will be skipped.

Currently supports glib-compile-schemas, gio-querymodules, and gtk-update-icon-cache.