/usr/include/simgear/scene/util/ is in libsimgear-dev 3.0.0-6+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/simgear/scene/util/ColorInterpolator.hxx
/usr/include/simgear/scene/util/CopyOp.hxx
/usr/include/simgear/scene/util/DeletionManager.hxx
/usr/include/simgear/scene/util/NodeAndDrawableVisitor.hxx
/usr/include/simgear/scene/util/Noise.hxx
/usr/include/simgear/scene/util/OptionsReadFileCallback.hxx
/usr/include/simgear/scene/util/OsgDebug.hxx
/usr/include/simgear/scene/util/OsgMath.hxx
/usr/include/simgear/scene/util/OsgSingleton.hxx
/usr/include/simgear/scene/util/PrimitiveUtils.hxx
/usr/include/simgear/scene/util/QuadTreeBuilder.hxx
/usr/include/simgear/scene/util/RenderConstants.hxx
/usr/include/simgear/scene/util/SGDebugDrawCallback.hxx
/usr/include/simgear/scene/util/SGEnlargeBoundingBox.hxx
/usr/include/simgear/scene/util/SGNodeMasks.hxx
/usr/include/simgear/scene/util/SGPickCallback.hxx
/usr/include/simgear/scene/util/SGReaderWriterOptions.hxx
/usr/include/simgear/scene/util/SGSceneFeatures.hxx
/usr/include/simgear/scene/util/SGSceneUserData.hxx
/usr/include/simgear/scene/util/SGStateAttributeVisitor.hxx
/usr/include/simgear/scene/util/SGTextureStateAttributeVisitor.hxx
/usr/include/simgear/scene/util/SGUpdateVisitor.hxx
/usr/include/simgear/scene/util/SplicingVisitor.hxx
/usr/include/simgear/scene/util/StateAttributeFactory.hxx
/usr/include/simgear/scene/util/UpdateOnceCallback.hxx
/usr/include/simgear/scene/util/VectorArrayAdapter.hxx
/usr/include/simgear/scene/util/parse_color.hxx
/usr/include/simgear/scene/util/project.hxx