Created attachment 376512 [details] setlayout-9999.ebuild Please, add setlayout to portage. From the openbox FAQ: How do I put my desktops into a grid layout instead of a single row? Your pager is responsible for doing this, and communicates with Openbox to make sure they agree on it. Any pager which complies with the EWMH specification should be able to do this. Examples are the gnome-panel pager and rox-pager. If your pager does not comply with the spec, or you don't use a pager, you can use this small program to set the layout at startup, for example setlayout 0 2 2 0 for a 2x2 grid.
Created attachment 376514 [details] setlayout-9999.ebuild Fix dependency.