when trying to update world esound was blocking so i removed it to see what happens. after this building kdelib failed on missing /usr/lib/libesd.la. adding media-sound/esound to kdelibs-3.5.5-r7.ebuild fixed this problem as expected. Reproducible: Didn't try
If you unmerge something (apparently misunderstanding what's the blocker about), then run revdep-rebuild instead of wondering why stuff breaks. *** This bug has been marked as a duplicate of bug 153621 ***