/usr/include/sofa/helper/gl/ is in libsofa1-dev 1.0~beta4-12.
This file is owned by root:root, with mode 0o755.
..
/usr/include/sofa/helper/gl/Axis.h
/usr/include/sofa/helper/gl/BasicShapes.h
/usr/include/sofa/helper/gl/Capture.h
/usr/include/sofa/helper/gl/Cylinder.h
/usr/include/sofa/helper/gl/DrawManager.h
/usr/include/sofa/helper/gl/FrameBufferObject.h
/usr/include/sofa/helper/gl/GLSLShader.h
/usr/include/sofa/helper/gl/RAII.h
/usr/include/sofa/helper/gl/Texture.h
/usr/include/sofa/helper/gl/Trackball.h
/usr/include/sofa/helper/gl/Transformation.h
/usr/include/sofa/helper/gl/VisualParameters.h
/usr/include/sofa/helper/gl/glText.h
/usr/include/sofa/helper/gl/glText.inl
/usr/include/sofa/helper/gl/glfont.h
/usr/include/sofa/helper/gl/template.h