/usr/include/sofa/simulation/tree/ is in libsofa1-dev 1.0~beta4-8build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sofa/simulation/tree/DeleteVisitor.h
/usr/include/sofa/simulation/tree/ExportDotVisitor.h
/usr/include/sofa/simulation/tree/GNode.h
/usr/include/sofa/simulation/tree/GNodeVisitor.h
/usr/include/sofa/simulation/tree/MutationListener.h
/usr/include/sofa/simulation/tree/ParallelVisitorScheduler.h
/usr/include/sofa/simulation/tree/TreeSimulation.h
/usr/include/sofa/simulation/tree/tree.h
/usr/include/sofa/simulation/tree/xml/
/usr/include/sofa/simulation/tree/xml/AttributeElement.h
/usr/include/sofa/simulation/tree/xml/BaseElement.h
/usr/include/sofa/simulation/tree/xml/DataElement.h
/usr/include/sofa/simulation/tree/xml/Element.h
/usr/include/sofa/simulation/tree/xml/Element.inl
/usr/include/sofa/simulation/tree/xml/NodeElement.h
/usr/include/sofa/simulation/tree/xml/ObjectElement.h
/usr/include/sofa/simulation/tree/xml/ObjectFactory.h
/usr/include/sofa/simulation/tree/xml/XML.h
/usr/include/sofa/simulation/tree/xml/initXml.h