/usr/ is in libowncloudsync-dev 2.4.1+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/owncloudsync/
/usr/include/owncloudsync/creds/
/usr/include/owncloudsync/creds/abstractcredentials.h
/usr/include/owncloudsync/creds/httpcredentials.h
/usr/include/owncloudsync/mirall/
/usr/include/owncloudsync/mirall/account.h
/usr/include/owncloudsync/mirall/configfile.h
/usr/include/owncloudsync/mirall/networkjobs.h
/usr/include/owncloudsync/mirall/progressdispatcher.h
/usr/include/owncloudsync/mirall/syncengine.h
/usr/include/owncloudsync/mirall/syncfileitem.h
/usr/include/owncloudsync/mirall/syncresult.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/owncloud/
/usr/share/
/usr/share/doc/
/usr/share/doc/libowncloudsync-dev/
/usr/share/doc/libowncloudsync-dev/copyright
/usr/lib/x86_64-linux-gnu/libowncloudsync.so
/usr/lib/x86_64-linux-gnu/owncloud/libocsync.so
/usr/share/doc/libowncloudsync-dev/NEWS.Debian.gz
/usr/share/doc/libowncloudsync-dev/changelog.Debian.gz