This was a change made in CVS. They changed the source so that Network and Game versions are two different things. This patch just makes it multiplayer compatible with all older versions since 1.1.8. See URL for CVS diff. Seemed prudent to add to the ebuild. Patch attached.
Created attachment 45112 [details, diff] Multiplayer compatibility patch
1.11.1-r1 has this now, thanks ! :)