/usr/include/libkfbapi/ is in libkfbapi-dev 1.0-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libkfbapi/alleventslistjob.h
/usr/include/libkfbapi/allnoteslistjob.h
/usr/include/libkfbapi/allpostslistjob.h
/usr/include/libkfbapi/appinfo.h
/usr/include/libkfbapi/authenticationdialog.h
/usr/include/libkfbapi/commentinfo.h
/usr/include/libkfbapi/eventinfo.h
/usr/include/libkfbapi/eventjob.h
/usr/include/libkfbapi/eventslistjob.h
/usr/include/libkfbapi/facebookjobs.h
/usr/include/libkfbapi/friendjob.h
/usr/include/libkfbapi/friendlistjob.h
/usr/include/libkfbapi/getcommentsjob.h
/usr/include/libkfbapi/getlikesjob.h
/usr/include/libkfbapi/libkfbapi_export.h
/usr/include/libkfbapi/likeinfo.h
/usr/include/libkfbapi/listjobbase.h
/usr/include/libkfbapi/noteaddjob.h
/usr/include/libkfbapi/noteinfo.h
/usr/include/libkfbapi/notejob.h
/usr/include/libkfbapi/noteslistjob.h
/usr/include/libkfbapi/notificationinfo.h
/usr/include/libkfbapi/notificationslistjob.h
/usr/include/libkfbapi/notificationsmarkreadjob.h
/usr/include/libkfbapi/pagedlistjob.h
/usr/include/libkfbapi/photojob.h
/usr/include/libkfbapi/postaddjob.h
/usr/include/libkfbapi/postinfo.h
/usr/include/libkfbapi/postjob.h
/usr/include/libkfbapi/postslistjob.h
/usr/include/libkfbapi/propertyinfo.h
/usr/include/libkfbapi/userinfo.h
/usr/include/libkfbapi/userinfojob.h