/usr/include/CEGUI/ImageCodecModules/ is in libcegui-mk2-dev 0.7.6-3.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CEGUI/ImageCodecModules/DevILImageCodec/
/usr/include/CEGUI/ImageCodecModules/DevILImageCodec/CEGUIDevILImageCodec.h
/usr/include/CEGUI/ImageCodecModules/DevILImageCodec/CEGUIDevILImageCodecModule.h
/usr/include/CEGUI/ImageCodecModules/FreeImageImageCodec/
/usr/include/CEGUI/ImageCodecModules/FreeImageImageCodec/CEGUIFreeImageImageCodec.h
/usr/include/CEGUI/ImageCodecModules/FreeImageImageCodec/CEGUIFreeImageImageCodecModule.h
/usr/include/CEGUI/ImageCodecModules/SILLYImageCodec/
/usr/include/CEGUI/ImageCodecModules/SILLYImageCodec/CEGUISILLYImageCodec.h
/usr/include/CEGUI/ImageCodecModules/SILLYImageCodec/CEGUISILLYImageCodecModule.h
/usr/include/CEGUI/ImageCodecModules/STBImageCodec/
/usr/include/CEGUI/ImageCodecModules/STBImageCodec/CEGUISTBImageCodec.h
/usr/include/CEGUI/ImageCodecModules/STBImageCodec/CEGUISTBImageCodecModule.h
/usr/include/CEGUI/ImageCodecModules/TGAImageCodec/
/usr/include/CEGUI/ImageCodecModules/TGAImageCodec/CEGUITGAImageCodec.h
/usr/include/CEGUI/ImageCodecModules/TGAImageCodec/CEGUITGAImageCodecModule.h