Package libgtk-3.0 (3.22.30-r0) is installed on root and has the following files:
/compat/linux/usr/share/themes/Emacs/gtk-3.0/gtk-keys.css
/compat/linux/usr/lib/libgdk-3.so.0.2200.30
/compat/linux/usr/lib/libgtk-3.so.0.2200.30
/compat/linux/usr/libexec/gtk-query-immodules-3.0
/compat/linux/etc/gtk-3.0/
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.exampleapp.gschema.xml
/compat/linux/usr/lib/libgailutil-3.so.0
/compat/linux/usr/bin/gtk-query-immodules-3.0
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.Settings.EmojiChooser.gschema.xml
/compat/linux/usr/share/glib-2.0/schemas/
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.Settings.Debug.gschema.xml
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.Demo.gschema.xml
/compat/linux/usr/share/themes/Emacs/gtk-3.0/
/compat/linux/usr/lib/girepository-1.0/Gtk-3.0.typelib
/compat/linux/usr/bin/gtk-launch
/compat/linux/usr/lib/libgailutil-3.so.0.0.0
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.Settings.FileChooser.gschema.xml
/compat/linux/usr/bin/gtk-update-icon-cache-3.0
/compat/linux/usr/share/glib-2.0/schemas/org.gtk.Settings.ColorChooser.gschema.xml
/compat/linux/usr/share/glib-2.0/
/compat/linux/usr/lib/girepository-1.0/GdkX11-3.0.typelib
/compat/linux/usr/share/themes/Default/gtk-3.0/
/compat/linux/usr/share/themes/Default/gtk-3.0/gtk-keys.css
/compat/linux/etc/gtk-3.0/im-multipress.conf
/compat/linux/usr/lib/libgdk-3.so.0
/compat/linux/usr/lib/libgtk-3.so.0
/compat/linux/usr/lib/girepository-1.0/Gdk-3.0.typelib