xps ~ # emerge emerge cups 
Calculating dependencies... done!
!!! Error: circular dependencies:

('ebuild', '/', 'net-print/foomatic-filters-ppds-20060720', 'merge') depends on
   ('ebuild', '/', 'net-print/foomatic-filters-3.0.20060720', 'merge') (medium)
   ('ebuild', '/', 'net-print/cups-1.2.6', 'merge') (soft)
('ebuild', '/', 'app-text/ghostscript-gpl-8.54', 'merge') depends on
   ('ebuild', '/', 'net-print/cups-1.2.6', 'merge') (hard)
('ebuild', '/', 'net-libs/gnutls-1.4.4-r1', 'merge') depends on
   ('ebuild', '/', 'dev-libs/lzo-2.02-r1', 'merge') (hard)
('ebuild', '/', 'dev-libs/lzo-2.02-r1', 'merge') depends on
   ('ebuild', '/', 'dev-lang/nasm-0.98.39-r3', 'merge') (hard)
('ebuild', '/', 'net-print/foomatic-filters-3.0.20060720', 'merge') depends on
   ('ebuild', '/', 'app-text/ghostscript-gpl-8.54', 'merge') (hard)
   ('ebuild', '/', 'net-print/cups-1.2.6', 'merge') (hard)
   ('ebuild', '/', 'virtual/ghostscript-0', 'merge') (hard)
('ebuild', '/', 'dev-lang/nasm-0.98.39-r3', 'merge') depends on
   ('ebuild', '/', 'app-text/ghostscript-gpl-8.54', 'merge') (hard)
   ('ebuild', '/', 'virtual/ghostscript-0', 'merge') (hard)
('ebuild', '/', 'net-print/cups-1.2.6', 'merge') depends on
   ('ebuild', '/', 'net-libs/gnutls-1.4.4-r1', 'merge') (hard)
('ebuild', '/', 'virtual/ghostscript-0', 'merge') depends on
   ('ebuild', '/', 'app-text/ghostscript-gpl-8.54', 'merge') (medium)
   ('ebuild', '/', 'net-print/cups-1.2.6', 'merge') (soft)
xps ~ #