/usr/ is in libqoauth-dev 2.0.1~1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/QtOAuth/
/usr/include/QtOAuth/QtOAuth
/usr/include/QtOAuth/interface.h
/usr/include/QtOAuth/qoauth_global.h
/usr/include/QtOAuth/qoauth_namespace.h
/usr/lib/
/usr/lib/libqoauth.prl
/usr/lib/pkgconfig/
/usr/lib/pkgconfig/qoauth.pc
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/qt5/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/oauth.prf
/usr/share/
/usr/share/doc/
/usr/share/doc/libqoauth-dev/
/usr/share/doc/libqoauth-dev/README
/usr/share/doc/libqoauth-dev/copyright
/usr/share/pkgconfig/
/usr/share/pkgconfig/qoauth.pc
/usr/lib/libqoauth.so
/usr/share/doc/libqoauth-dev/changelog.Debian.gz