~ # emerge -av --keep-going @kde-4.2 [blocks B ] <kde-base/plasma-workspace-4.2.1:4.2[kdeprefix] ("<kde-base/plasma-workspace-4.2.1:4.2[kdeprefix]" is blocking kde-base/kdebase-desktoptheme-4.2.1) [blocks B ] <kde-base/ksmserver-4.2.1:4.2[kdeprefix] ("<kde-base/ksmserver-4.2.1:4.2[kdeprefix]" is blocking kde-base/kcontrol-4.2.1) [blocks B ] =media-gfx/digikam-0.10.0_rc2[kdeprefix] ("=media-gfx/digikam-0.10.0_rc2[kdeprefix]" is blocking kde-base/kdebase-data-4.2.1) Total: 223 packages (222 upgrades, 1 new), Size of downloads: 307,812 kB Conflict: 4 blocks (3 unsatisfied) Portage tree and overlays: [0] /usr/portage [1] /usr/local/portage/layman/kde-testing * Error: The above package list contains packages which cannot be * installed at the same time on the same system. ('ebuild', '/', 'kde-base/kcontrol-4.2.1', 'merge') pulled in by kde-base/kcontrol:4.2 required by @kde-4.2 >=kde-base/kcontrol-4.2.1:4.2 required by ('ebuild', '/', 'kde-base/systemsettings-4.2.1', 'merge') ('ebuild', '/', 'kde-base/kdebase-desktoptheme-4.2.1', 'merge') pulled in by kde-base/kdebase-desktoptheme:4.2 required by @kde-4.2 >=kde-base/kdebase-desktoptheme-4.2.1:4.2[kdeprefix] required by ('ebuild', '/', 'kde-base/kdebase-startkde-4.2.1', 'merge') ('ebuild', '/', 'kde-base/kdebase-data-4.2.1', 'merge') pulled in by >=kde-base/kdebase-data-4.2.1:4.2[kdeprefix] required by ('ebuild', '/', 'kde-base/mimelib-4.2.1', 'merge') >=kde-base/kdebase-data-4.2.1:4.2[kdeprefix] required by ('ebuild', '/', 'kde-base/libkexiv2-4.2.1', 'merge') >=kde-base/kdebase-data-4.2.1:4.2[kdeprefix] required by ('ebuild', '/', 'kde-base/soliduiserver-4.2.1', 'merge') (and 218 more) ('installed', '/', 'media-gfx/digikam-0.10.0_rc2', 'nomerge') pulled in by media-gfx/digikam required by @world Reproducible: Always
Ok removed the blocking line that caused you headache. Try it again. Reopen if it is still issue.