/usr/include/OGRE/Overlay/ is in libogre-1.9-dev 1.9.0+dfsg1-7+b4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/OGRE/Overlay/OgreBorderPanelOverlayElement.h
/usr/include/OGRE/Overlay/OgreFont.h
/usr/include/OGRE/Overlay/OgreFontManager.h
/usr/include/OGRE/Overlay/OgreOverlay.h
/usr/include/OGRE/Overlay/OgreOverlayContainer.h
/usr/include/OGRE/Overlay/OgreOverlayElement.h
/usr/include/OGRE/Overlay/OgreOverlayElementCommands.h
/usr/include/OGRE/Overlay/OgreOverlayElementFactory.h
/usr/include/OGRE/Overlay/OgreOverlayManager.h
/usr/include/OGRE/Overlay/OgreOverlayPrerequisites.h
/usr/include/OGRE/Overlay/OgreOverlayProfileSessionListener.h
/usr/include/OGRE/Overlay/OgreOverlaySystem.h
/usr/include/OGRE/Overlay/OgrePanelOverlayElement.h
/usr/include/OGRE/Overlay/OgreTextAreaOverlayElement.h