I have just installed Spyderous' Portage overlay for freedesktop.org (with some difficulty) and needed to remerge IceWM but it didn't work because it was looking for Xinerama support, which doesn't appear to be present in freedesktop.org. There's a Xinerama USE flag and the ebuild wasn't making use of this so I made the necessary modifications myself. I thought I'd do it just to show that I'm not totally incapable. (-; Reproducible: Always Steps to Reproduce:
Created attachment 24453 [details] Makes use of the Xinerama USE flag
fixed thanks