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/usr/include/kactivelabel.h is in kdelibs5-dev 4:4.8.4-4+deb7u1.

This file is owned by root:root, with mode 0o644.

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//krazy:excludeall=license (there isn't really anything to this file)
#ifdef KDE_NO_COMPAT
#error kactivelabel.h does not exist anymore, please use Qlabel. see the KDE4 Porting Guide for more information.
#endif