/usr/include/x86_64-linux-gnu/qt5/Enginio/ is in libenginio1-dev 5.3.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/qt5/Enginio/1.0.6/
/usr/include/x86_64-linux-gnu/qt5/Enginio/1.0.6/Enginio/
/usr/include/x86_64-linux-gnu/qt5/Enginio/Enginio
/usr/include/x86_64-linux-gnu/qt5/Enginio/EnginioDepends
/usr/include/x86_64-linux-gnu/qt5/Enginio/EnginioVersion
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginio.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginiobasemodel.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioclient.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioclient_global.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioclientconnection.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioidentity.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginiomodel.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginiooauth2authentication.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioreply.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioreplystate.h
/usr/include/x86_64-linux-gnu/qt5/Enginio/enginioversion.h