/usr/include/CEGUI/WindowRendererSets/Falagard/ is in libcegui-mk2-dev 0.7.6-3.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CEGUI/WindowRendererSets/Falagard/FalButton.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalDefault.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalEditbox.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalEditboxProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalFrameWindow.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalItemEntry.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalItemListbox.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalListHeader.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalListHeaderProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalListHeaderSegment.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalListbox.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalMenuItem.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalMenubar.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalModule.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalMultiColumnList.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalMultiLineEditbox.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalMultiLineEditboxProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalPopupMenu.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalProgressBar.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalProgressBarProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalScrollablePane.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalScrollbar.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalScrollbarProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalSlider.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalSliderProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStatic.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStaticImage.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStaticImageProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStaticProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStaticText.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalStaticTextProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalSystemButton.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTabButton.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTabControl.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTabControlProperties.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTitlebar.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalToggleButton.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTooltip.h
/usr/include/CEGUI/WindowRendererSets/Falagard/FalTree.h