The ymessenger application will not function unless libgdk_pixbuf.so.2 is present: $ /opt/ymessenger/bin/ymessenger /opt/ymessenger/bin/ymessenger.bin: error while loading shared libraries: libgdk_pixbuf.so.2: cannot open shared object file: No such file or directory I think gdk-pixbuf should be added to the ymessenger ebuild's DEPEND. I've experienced this with ymessenger-0.99.19 on a 1.2 system.
nice catch