/usr/include/cegui-0.8.7/CEGUI/falagard/ is in libcegui-mk2-dev 0.8.7-1.3+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/cegui-0.8.7/CEGUI/falagard/ComponentBase.h
/usr/include/cegui-0.8.7/CEGUI/falagard/Dimensions.h
/usr/include/cegui-0.8.7/CEGUI/falagard/Enums.h
/usr/include/cegui-0.8.7/CEGUI/falagard/EventAction.h
/usr/include/cegui-0.8.7/CEGUI/falagard/EventLinkDefinition.h
/usr/include/cegui-0.8.7/CEGUI/falagard/FalagardPropertyBase.h
/usr/include/cegui-0.8.7/CEGUI/falagard/FormattingSetting.h
/usr/include/cegui-0.8.7/CEGUI/falagard/FrameComponent.h
/usr/include/cegui-0.8.7/CEGUI/falagard/ImageryComponent.h
/usr/include/cegui-0.8.7/CEGUI/falagard/ImagerySection.h
/usr/include/cegui-0.8.7/CEGUI/falagard/LayerSpecification.h
/usr/include/cegui-0.8.7/CEGUI/falagard/NamedArea.h
/usr/include/cegui-0.8.7/CEGUI/falagard/NamedDefinitionCollator.h
/usr/include/cegui-0.8.7/CEGUI/falagard/PropertyDefinition.h
/usr/include/cegui-0.8.7/CEGUI/falagard/PropertyDefinitionBase.h
/usr/include/cegui-0.8.7/CEGUI/falagard/PropertyInitialiser.h
/usr/include/cegui-0.8.7/CEGUI/falagard/PropertyLinkDefinition.h
/usr/include/cegui-0.8.7/CEGUI/falagard/SectionSpecification.h
/usr/include/cegui-0.8.7/CEGUI/falagard/StateImagery.h
/usr/include/cegui-0.8.7/CEGUI/falagard/TextComponent.h
/usr/include/cegui-0.8.7/CEGUI/falagard/WidgetComponent.h
/usr/include/cegui-0.8.7/CEGUI/falagard/WidgetLookFeel.h
/usr/include/cegui-0.8.7/CEGUI/falagard/WidgetLookManager.h
/usr/include/cegui-0.8.7/CEGUI/falagard/XMLEnumHelper.h
/usr/include/cegui-0.8.7/CEGUI/falagard/XMLHandler.h