/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/ is in libcegui-mk2-dev 0.8.4+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/EventPusher.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/GeometryBuffer.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/ImageCodec.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/MemoryFile.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/RenderTarget.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/RenderTarget.inl
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/Renderer.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/RendererDef.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/ResourceProvider.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/Texture.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/TextureTarget.h
/usr/include/cegui-0.8.4/CEGUI/RendererModules/Irrlicht/WindowTarget.h