/usr/include/ is in libphonon4qt5experimental-dev 4:4.9.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/phonon4qt5/
/usr/include/phonon4qt5/KDE/
/usr/include/phonon4qt5/KDE/Phonon/
/usr/include/phonon4qt5/KDE/Phonon/Experimental/
/usr/include/phonon4qt5/KDE/Phonon/Experimental/AbstractVideoDataOutput
/usr/include/phonon4qt5/KDE/Phonon/Experimental/AudioDataOutput
/usr/include/phonon4qt5/KDE/Phonon/Experimental/SnapshotInterface
/usr/include/phonon4qt5/KDE/Phonon/Experimental/VideoDataOutput
/usr/include/phonon4qt5/KDE/Phonon/Experimental/VideoDataOutputInterface
/usr/include/phonon4qt5/KDE/Phonon/Experimental/VideoFrame
/usr/include/phonon4qt5/KDE/Phonon/Experimental/VideoFrame2
/usr/include/phonon4qt5/KDE/Phonon/Experimental/Visualization