Please add uxdgmenu to portage. From uxdgmenu documentation: uxdgmenu is an automated XDG Menu system for alternative Linux window managers. It supports currently Fluxbox, Openbox, Awesome, Blackbox, WindowMaker, FVWM2, IceWM, Ion3, PekWM, TWM, support can be added to any other through plugins. uxdgmenu monitors for newly installed/removed applications, and maintains a submenu, listing and categorizing them like the Gnome/Xfce/Lxde menu. It can also monitor your gtk bookmarks and recent files, and comes with a standalone GTK app-launcher and a GUI for configuration.