n22 ~ # emerge --keep-going --nospinner --changed-use --update --ask --deep --tree --with-bdeps=y @world
These are the packages that would be merged, in reverse order:

Calculating dependencies  .. ... done!
[nomerge       ] media-plugins/kipi-plugins-1.9.0 
[ebuild     U ~]  kde-base/libkdcraw-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kdeplasma-addons-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kfourinline-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kmag-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kscd-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kmahjongg-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/okular-4.6.5 [4.6.4-r1]
[ebuild     U ~] kde-base/juk-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kompare-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kruler-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kget-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/ark-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/ktux-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kolourpaint-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kmines-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kdemultimedia-kioslaves-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kmix-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kdesdk-kioslaves-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/ksnapshot-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kdeartwork-kscreensaver-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/krdc-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kbattleship-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kdebase-meta-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kgeography-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kpat-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kate-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/okteta-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kalzium-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/sweeper-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kgpg-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kcalc-4.6.5 [4.6.4]
[ebuild     U ~] kde-base/kigo-4.6.5 [4.6.4]
[nomerge       ] kde-base/kalzium-4.6.5 [4.6.4]
[ebuild     U ~]  kde-base/libkdeedu-4.6.5 [4.6.4]

Would you like to merge these packages? [Yes/No] 

>>> Verifying ebuild manifests

>>> Starting parallel fetch

>>> Emerging (1 of 33) kde-base/libkdeedu-4.6.5
 * kdeedu-4.6.5.tar.bz2 RMD160 SHA1 SHA256 size ;-) ...                                                          [ ok ]
 * Package:    kde-base/libkdeedu-4.6.5
 * Repository: gentoo
 * Maintainer: kde@gentoo.org
 * USE:        consolekit elibc_glibc kernel_linux policykit test userland_GNU x86
 * FEATURES:   ccache sandbox
>>> Unpacking source...
 * Unpacking parts of kdeedu-4.6.5.tar.bz2 to /var/tmp/portage/kde-base/libkdeedu-4.6.5/work ...
tar extract command failed at least partially - continuing anyway                                                [ ok ]
>>> Source unpacked in /var/tmp/portage/kde-base/libkdeedu-4.6.5/work
>>> Preparing source in /var/tmp/portage/kde-base/libkdeedu-4.6.5/work/libkdeedu-4.6.5 ...
find: `/var/tmp/portage/kde-base/libkdeedu-4.6.5/work/libkdeedu-4.6.5/cmake/modules/': No such file or directory
sed: no input files
 * ERROR: kde-base/libkdeedu-4.6.5 failed (prepare phase):
 *   3296: sed died uncommenting add_subdirectory instructions in KMEXTRA section while processing cmake/modules/
 * 
 * Call stack:
 *     ebuild.sh, line   56:  Called src_prepare
 *   environment, line 4383:  Called kde4-meta_src_prepare
 *   environment, line 3567:  Called kde4-meta_change_cmakelists
 *   environment, line 3296:  Called die
 * The specific snippet of code:
 *           find "${S}"/${i} -name CMakeLists.txt -print0 | xargs -0 sed -i -e 's/^#DONOTCOMPILE //g' || die "${LINENO}: sed died uncommenting add_subdirectory instructions in KMEXTRA section while processing ${i}";
 * 
 * If you need support, post the output of 'emerge --info =kde-base/libkdeedu-4.6.5',
 * the complete build log and the output of 'emerge -pqv =kde-base/libkdeedu-4.6.5'.
 * The complete build log is located at '/var/log/portage/kde-base:libkdeedu-4.6.5:20110709-190013.log.gz'.
 * The ebuild environment file is located at '/var/tmp/portage/kde-base/libkdeedu-4.6.5/temp/environment'.
 * S: '/var/tmp/portage/kde-base/libkdeedu-4.6.5/work/libkdeedu-4.6.5'

>>> Failed to emerge kde-base/libkdeedu-4.6.5, Log file:

>>>  '/var/log/portage/kde-base:libkdeedu-4.6.5:20110709-190013.log.gz'
*** Resuming merge...

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

Calculating dependencies  .... done!
 * One or more packages are either masked or have missing dependencies:
 * 
 *   >=kde-base/libkdeedu-4.6.5:4[-aqua] pulled in by:
 *     (kde-base/kalzium-4.6.5::gentoo, ebuild scheduled for merge)
 * 
 * The resume list contains packages that are either masked or have
 * unsatisfied dependencies. Please restart/continue the operation
 * manually, or use --skipfirst to skip the first package in the list and
 * any other packages that may be masked or have missing dependencies.
 * 
 * The following package has failed to build or install:
 * 
 *  (kde-base/libkdeedu-4.6.5::gentoo, ebuild scheduled for merge), Log file:
 *   '/var/log/portage/kde-base:libkdeedu-4.6.5:20110709-190013.log.gz'
 * 
n22 ~ #