/usr/include/CEGUI/falagard/ is in libcegui-mk2-dev 0.7.5-8.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CEGUI/falagard/CEGUIFalComponentBase.h
/usr/include/CEGUI/falagard/CEGUIFalDimensions.h
/usr/include/CEGUI/falagard/CEGUIFalEnums.h
/usr/include/CEGUI/falagard/CEGUIFalFrameComponent.h
/usr/include/CEGUI/falagard/CEGUIFalImageryComponent.h
/usr/include/CEGUI/falagard/CEGUIFalImagerySection.h
/usr/include/CEGUI/falagard/CEGUIFalLayerSpecification.h
/usr/include/CEGUI/falagard/CEGUIFalNamedArea.h
/usr/include/CEGUI/falagard/CEGUIFalPropertyDefinition.h
/usr/include/CEGUI/falagard/CEGUIFalPropertyDefinitionBase.h
/usr/include/CEGUI/falagard/CEGUIFalPropertyInitialiser.h
/usr/include/CEGUI/falagard/CEGUIFalPropertyLinkDefinition.h
/usr/include/CEGUI/falagard/CEGUIFalSectionSpecification.h
/usr/include/CEGUI/falagard/CEGUIFalStateImagery.h
/usr/include/CEGUI/falagard/CEGUIFalTextComponent.h
/usr/include/CEGUI/falagard/CEGUIFalWidgetComponent.h
/usr/include/CEGUI/falagard/CEGUIFalWidgetLookFeel.h
/usr/include/CEGUI/falagard/CEGUIFalWidgetLookManager.h
/usr/include/CEGUI/falagard/CEGUIFalXMLEnumHelper.h