/usr/include/libkvkontakte/ is in libkvkontakte-dev 1.0~digikam2.5.0-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libkvkontakte/albuminfo.h
/usr/include/libkvkontakte/albumlistjob.h
/usr/include/libkvkontakte/allmessageslistjob.h
/usr/include/libkvkontakte/allnoteslistjob.h
/usr/include/libkvkontakte/authenticationdialog.h
/usr/include/libkvkontakte/cidsnamesjob.h
/usr/include/libkvkontakte/createalbumjob.h
/usr/include/libkvkontakte/deletealbumjob.h
/usr/include/libkvkontakte/discussionslistjob.h
/usr/include/libkvkontakte/editalbumjob.h
/usr/include/libkvkontakte/friendlistjob.h
/usr/include/libkvkontakte/getapplicationpermissionsjob.h
/usr/include/libkvkontakte/getinfojob.h
/usr/include/libkvkontakte/getvariablejob.h
/usr/include/libkvkontakte/groupinfo.h
/usr/include/libkvkontakte/grouplistjob.h
/usr/include/libkvkontakte/libkvkontakte_export.h
/usr/include/libkvkontakte/messageinfo.h
/usr/include/libkvkontakte/messageslistjob.h
/usr/include/libkvkontakte/noteaddjob.h
/usr/include/libkvkontakte/noteinfo.h
/usr/include/libkvkontakte/notejob.h
/usr/include/libkvkontakte/noteslistjob.h
/usr/include/libkvkontakte/photoinfo.h
/usr/include/libkvkontakte/photojob.h
/usr/include/libkvkontakte/photolistjob.h
/usr/include/libkvkontakte/qintlist.h
/usr/include/libkvkontakte/uploadphotosjob.h
/usr/include/libkvkontakte/userinfo.h
/usr/include/libkvkontakte/userinfofulljob.h
/usr/include/libkvkontakte/userinfojob.h
/usr/include/libkvkontakte/version.h
/usr/include/libkvkontakte/vkontaktejobs.h