The error itself:
/home/vlad/Workspace/KDE/src/kde/workspace/libksysguard/ksgrd/SensorAgent.cpp: In member function ‘void KSGRD::SensorAgent::executeCommand()’: /home/vlad/Workspace/KDE/src/kde/workspace/libksysguard/ksgrd/SensorAgent.cpp:210:60: error: ‘class QString’ has no member named ‘toAscii’ qCDebug(LIBKSYSGUARD_KSGRD) << ">> " << req->request().toAscii() << "(" << mInputFIFO.count() ^~~~~~~ ninja: build stopped: subcommand failed.