/usr/include/gupnp-av-1.0/libgupnp-av/ is in libgupnp-av-1.0-dev 0.12.8-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-av-enums.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-av-error.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-av.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-cds-last-change-parser.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-container.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-contributor.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-createclass.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-descriptor.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-item.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-object.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-parser.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-resource.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-didl-lite-writer.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-dlna.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-feature-list-parser.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-feature.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-last-change-parser.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-media-collection.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-protocol-info.h
/usr/include/gupnp-av-1.0/libgupnp-av/gupnp-search-criteria-parser.h