/usr/include/x86_64-linux-gnu/ is in libqtav-dev 1.12.0+ds-4build3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/x86_64-linux-gnu/qt5/
/usr/include/x86_64-linux-gnu/qt5/QtAV/
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVClock.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVDecoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVDemuxer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVEncoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVError.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVMuxer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVOutput.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVPlayer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AVTranscoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioDecoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioEncoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioFormat.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioFrame.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioOutput.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/AudioResampler.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/ConvolutionShader.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/EncodeFilter.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/FactoryDefine.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Filter.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/FilterContext.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Frame.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/FrameReader.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/GLSLFilter.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Geometry.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/GeometryRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/LibAVFilter.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/MediaIO.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/OpenGLRendererBase.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/OpenGLTypes.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/OpenGLVideo.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/OpenGLWindowRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Packet.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/QPainterRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/QtAV
/usr/include/x86_64-linux-gnu/qt5/QtAV/QtAV.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/QtAV_Global.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Statistics.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/SubImage.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/Subtitle.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/SubtitleFilter.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/SurfaceInterop.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoCapture.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoDecoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoEncoder.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoFormat.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoFrame.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoFrameExtractor.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoOutput.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoShader.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/VideoShaderObject.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/dptr.h
/usr/include/x86_64-linux-gnu/qt5/QtAV/version.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/GLWidgetRenderer2.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/GraphicsItemRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/OpenGLWidgetRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/QtAVWidgets
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/QtAVWidgets.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/VideoPreviewWidget.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/WidgetRenderer.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/global.h
/usr/include/x86_64-linux-gnu/qt5/QtAVWidgets/version.h