/usr/include/ is in libqtav-private-dev 1.12.0+ds-4build3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/qt5/
/usr/include/x86_64-linux-gnu/qt5/QtAV/
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AVCompat.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AVDecoder_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AVEncoder_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AVOutput_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AudioOutputBackend.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/AudioResampler_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/Filter_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/Frame_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/MediaIO_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/OpenGLRendererBase_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/PlayerSubtitle.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/QPainterRenderer_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/SubtitleProcessor.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/VideoRenderer_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/VideoShader_p.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/factory.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/mkid.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/prepost.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/5.9.5/QtAV/private/singleton.h