!!! Multiple versions within a single package slot have been 
!!! pulled into the dependency graph:

('installed', '/', 'sys-kernel/linux-headers-2.6.19.2-r2', 'nomerge') pulled in by
  ('ebuild', '/', 'media-video/mplayer-1.0.20070427', 'merge')

('ebuild', '/', 'sys-kernel/linux-headers-2.6.20-r2', 'merge') pulled in by
  ('ebuild', '/', 'sys-apps/hal-0.5.7.1-r5', 'merge')
  ('installed', '/', 'media-tv/linuxtv-dvb-headers-3.1', 'nomerge')