see summary installed kde:4 with kdeprefix use flag
[blocks B ] kde-base/kde-env ("kde-base/kde-env" is blocking kde-base/kdelibs-3.5.10-r2) * Error: The above package list contains packages which cannot be * installed at the same time on the same system. ('installed', '/', 'kde-base/kdelibs-3.5.10-r2', 'nomerge') pulled in by ~kde-base/kdelibs-3.5.10 required by ('installed', '/', 'kde-base/qtjava-3.5.10', 'nomerge') ~kde-base/kdelibs-3.5.10 required by ('installed', '/', 'kde-base/khelpcenter-3.5.10', 'nomerge') =kde-base/kdelibs-3.5* required by ('installed', '/', 'app-office/kspread-1.6.3_p20090204', 'nomerge') (and 331 more) ('ebuild', '/', 'kde-base/kde-env-4.2.3', 'merge') pulled in by >=kde-base/kde-env-4.2.3:4.2[kdeprefix] required by ('ebuild', '/', 'kde-base/kdelibs-4.2.3', 'merge')
bumped kdelibs added blocker fixed