These are the packages that would be merged, in order:

Calculating dependencies  ..... ..... done!
[nomerge      ] kde-base/kdebase-meta-3.5.5  
[nomerge      ]  kde-base/kstart-3.5.0  USE="arts kdeenablefinal -debug -kdehiddenvisibility -kdexdeltas -xinerama" 
[nomerge      ]   kde-base/kdelibs-3.5.5-r9  USE="alsa arts cups doc kdeenablefinal ssl -acl -avahi -debug -fam -jpeg2k -kdehiddenvisibility -kerberos -legacyssl -lua -openexr -spell -tiff -utempter -xinerama -zeroconf" LINGUAS="-he" 
[ebuild  N    ]    media-libs/alsa-lib-1.0.14_rc1  USE="doc -debug" 
[ebuild  N    ]     app-doc/doxygen-1.4.7  USE="doc qt3 unicode -tetex" 
[ebuild  N    ]      media-gfx/graphviz-2.12  USE="X doc nls perl python -examples -gnome -gtk -pango -ruby -tcl -tk" 
[ebuild  N    ]       dev-lang/swig-1.3.31  USE="doc java perl python -guile -lua -mono -ocaml -php -pike -ruby -tcl -tk" 
[ebuild  N    ]        virtual/jdk-1.5.0  
[ebuild  N    ]         dev-java/sun-jdk-1.5.0.10  USE="X alsa doc -examples -jce -nsplugin" 
!!! Error: circular dependencies:

('ebuild', '/', 'media-gfx/graphviz-2.12', 'merge') depends on
   ('ebuild', '/', 'dev-lang/swig-1.3.31', 'merge') (hard)
('ebuild', '/', 'dev-lang/swig-1.3.31', 'merge') depends on
   ('ebuild', '/', 'dev-java/sun-jdk-1.5.0.10', 'merge') (hard)
   ('ebuild', '/', 'virtual/jdk-1.5.0', 'merge') (hard)
('ebuild', '/', 'virtual/jdk-1.5.0', 'merge') depends on
   ('ebuild', '/', 'dev-java/sun-jdk-1.5.0.10', 'merge') (medium)
('ebuild', '/', 'dev-java/sun-jdk-1.5.0.10', 'merge') depends on
   ('ebuild', '/', 'media-libs/alsa-lib-1.0.14_rc1', 'merge') (medium)
('ebuild', '/', 'media-libs/alsa-lib-1.0.14_rc1', 'merge') depends on
   ('ebuild', '/', 'app-doc/doxygen-1.4.7', 'merge') (hard)
('ebuild', '/', 'app-doc/doxygen-1.4.7', 'merge') depends on
   ('ebuild', '/', 'media-gfx/graphviz-2.12', 'merge') (hard)

!!! Note that circular dependencies can often be avoided by temporarily
!!! disabling USE flags that trigger optional dependencies.