/usr/include/sofa/gui/ is in libsofa1-dev 1.0~beta4-11+b3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sofa/gui/BatchGUI.h
/usr/include/sofa/gui/SofaGUI.h
/usr/include/sofa/gui/glut/
/usr/include/sofa/gui/glut/SimpleGUI.h
/usr/include/sofa/gui/qt/
/usr/include/sofa/gui/qt/AddObject.h
/usr/include/sofa/gui/qt/BaseGenGraphForm.h
/usr/include/sofa/gui/qt/DialogAddObject.h
/usr/include/sofa/gui/qt/DisplayFlagWidget.h
/usr/include/sofa/gui/qt/FileManagement.h
/usr/include/sofa/gui/qt/GUI.h
/usr/include/sofa/gui/qt/GenGraphForm.h
/usr/include/sofa/gui/qt/GraphDataWidget.h
/usr/include/sofa/gui/qt/GraphListenerQListView.h
/usr/include/sofa/gui/qt/GraphVisitor.h
/usr/include/sofa/gui/qt/ImageQt.h
/usr/include/sofa/gui/qt/Main.h
/usr/include/sofa/gui/qt/ModifyObject.h
/usr/include/sofa/gui/qt/PieWidget.h
/usr/include/sofa/gui/qt/PluginManager.h
/usr/include/sofa/gui/qt/RealGUI.h
/usr/include/sofa/gui/qt/SimpleDataWidget.h
/usr/include/sofa/gui/qt/SofaPluginManager.h
/usr/include/sofa/gui/qt/StructDataWidget.h
/usr/include/sofa/gui/qt/TableDataWidget.h
/usr/include/sofa/gui/qt/VisitorGUI.h
/usr/include/sofa/gui/qt/WFloatLineEdit.h
/usr/include/sofa/gui/qt/WindowVisitor.h
/usr/include/sofa/gui/qt/viewer/
/usr/include/sofa/gui/qt/viewer/SofaViewer.h
/usr/include/sofa/gui/qt/viewer/qgl/
/usr/include/sofa/gui/qt/viewer/qgl/QtGLViewer.h
/usr/include/sofa/gui/qt/viewer/qt/
/usr/include/sofa/gui/qt/viewer/qt/QtViewer.h
/usr/include/sofa/gui/qt/viewer/qtogre/
/usr/include/sofa/gui/qt/viewer/qtogre/DotSceneLoader.h
/usr/include/sofa/gui/qt/viewer/qtogre/OgreVisualModel.h
/usr/include/sofa/gui/qt/viewer/qtogre/QOgreLightWidget.h
/usr/include/sofa/gui/qt/viewer/qtogre/QtOgreViewer.h