/usr/ is in libsignon-qt5-dev 8.59+17.10.20170606-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/signon-qt5/
/usr/include/signon-qt5/SignOn/
/usr/include/signon-qt5/SignOn/AuthService
/usr/include/signon-qt5/SignOn/AuthSession
/usr/include/signon-qt5/SignOn/Error
/usr/include/signon-qt5/SignOn/Identity
/usr/include/signon-qt5/SignOn/IdentityInfo
/usr/include/signon-qt5/SignOn/SessionData
/usr/include/signon-qt5/SignOn/authservice.h
/usr/include/signon-qt5/SignOn/authsession.h
/usr/include/signon-qt5/SignOn/identity.h
/usr/include/signon-qt5/SignOn/identityinfo.h
/usr/include/signon-qt5/SignOn/libsignoncommon.h
/usr/include/signon-qt5/SignOn/sessiondata.h
/usr/include/signon-qt5/SignOn/signon.h
/usr/include/signon-qt5/SignOn/signonerror.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/SignOnQt5/
/usr/lib/x86_64-linux-gnu/cmake/SignOnQt5/SignOnQt5Config.cmake
/usr/lib/x86_64-linux-gnu/cmake/SignOnQt5/SignOnQt5ConfigVersion.cmake
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libsignon-qt5.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libsignon-qt5-dev/
/usr/share/doc/libsignon-qt5-dev/copyright
/usr/lib/x86_64-linux-gnu/libsignon-qt5.so
/usr/share/doc/libsignon-qt5-dev/changelog.Debian.gz