/usr/include/simgear/scene/tgdb/ is in libsimgear-dev 3.0.0-6+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/simgear/scene/tgdb/GroundLightManager.hxx
/usr/include/simgear/scene/tgdb/ReaderWriterSPT.hxx
/usr/include/simgear/scene/tgdb/ReaderWriterSTG.hxx
/usr/include/simgear/scene/tgdb/SGBuildingBin.hxx
/usr/include/simgear/scene/tgdb/SGDirectionalLightBin.hxx
/usr/include/simgear/scene/tgdb/SGLightBin.hxx
/usr/include/simgear/scene/tgdb/SGModelBin.hxx
/usr/include/simgear/scene/tgdb/SGOceanTile.hxx
/usr/include/simgear/scene/tgdb/SGReaderWriterBTG.hxx
/usr/include/simgear/scene/tgdb/SGTexturedTriangleBin.hxx
/usr/include/simgear/scene/tgdb/SGTriangleBin.hxx
/usr/include/simgear/scene/tgdb/SGVasiDrawable.hxx
/usr/include/simgear/scene/tgdb/SGVertexArrayBin.hxx
/usr/include/simgear/scene/tgdb/ShaderGeometry.hxx
/usr/include/simgear/scene/tgdb/TreeBin.hxx
/usr/include/simgear/scene/tgdb/apt_signs.hxx
/usr/include/simgear/scene/tgdb/obj.hxx
/usr/include/simgear/scene/tgdb/pt_lights.hxx
/usr/include/simgear/scene/tgdb/userdata.hxx