kde-base/kcmshell
KCMShell is a utility to host KDE control modules independently of SystemSettings.
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debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml
kdeprefix
Global: Makes a KDE prefixed install into /usr/kde/$ if enabled or into /usr (FHS compatible) otherwise