/usr/include/razorqt/ is in librazorqt0-dev 0.5.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/razorqt/addplugindialog.h
/usr/include/razorqt/libtranslate.h
/usr/include/razorqt/pageselectwidget.h
/usr/include/razorqt/powermanager.h
/usr/include/razorqt/razoraboutdlg.h
/usr/include/razorqt/razorapplication.h
/usr/include/razorqt/razorconfigdialog.h
/usr/include/razorqt/razornotification.h
/usr/include/razorqt/razorplugininfo.h
/usr/include/razorqt/razorpower.h
/usr/include/razorqt/razorsettings.h
/usr/include/razorqt/razorshortcutbutton.h
/usr/include/razorqt/screensaver.h
/usr/include/razorqt/translatorsinfo.h
/usr/include/razorqt/xfitman.h