When upgrading, if kdelibs4-dev is installed, kdelibs5-dev needs to be installed. See bugs.launchpad.net, bug #279621 for details.
Bertsio berri bat ezartzean, kdelibs4-dev instalatuta badago, kdelibs5-dev instalatu behar da. Ikusi bugs.launchpad.net, bug #279621 xehetasun gehiagorako.