/usr/include/GNUstep/ is in paje.app 1.98-1+b2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/GNUstep/AggregatingFilter/
/usr/include/GNUstep/AggregatingFilter/AggregateEvent.h
/usr/include/GNUstep/AggregatingFilter/AggregateLink.h
/usr/include/GNUstep/AggregatingFilter/AggregateState.h
/usr/include/GNUstep/AggregatingFilter/AggregateValue.h
/usr/include/GNUstep/AggregatingFilter/AggregatingChunk.h
/usr/include/GNUstep/AggregatingFilter/AggregatingChunkArray.h
/usr/include/GNUstep/AggregatingFilter/AggregatingFilter.h
/usr/include/GNUstep/AggregatingFilter/EntityAggregator.h
/usr/include/GNUstep/ContainerFilter/
/usr/include/GNUstep/ContainerFilter/ContainerSelector.h
/usr/include/GNUstep/EntityTypeFilter/
/usr/include/GNUstep/EntityTypeFilter/EntityTypeSelector.h
/usr/include/GNUstep/FieldFilter/
/usr/include/GNUstep/FieldFilter/FieldFilter.h
/usr/include/GNUstep/FieldFilter/FieldFilterDescriptor.h
/usr/include/GNUstep/Frameworks/
/usr/include/GNUstep/Frameworks/General.framework/
/usr/include/GNUstep/Frameworks/General.framework/Headers
/usr/include/GNUstep/Frameworks/General.framework/Versions/
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/Association.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/CStringCallBacks.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/ChunkArray.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/ColoredSwitchButtonCell.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/Comparing.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/CondensedEntitiesArray.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/DataScanner.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/EntityChunk.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/FilteredEnumerator.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/FoundationAdditions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/HierarchyBrowser.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/Macros.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/MultiEnumerator.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSArray+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSColor+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSDate+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSDictionary+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSMatrix+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSObject+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSString+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/NSUserDefaults+Additions.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PSortedArray.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PTime.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeContainer.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeEntity.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeEntityInspector.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeEvent.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeFilter.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/PajeType.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/Protocols.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/SourceCodeReference.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/SourceTextController.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/TranslationTable.h
/usr/include/GNUstep/Frameworks/General.framework/Versions/0/UniqueString.h
/usr/include/GNUstep/General
/usr/include/GNUstep/ImbricationFilter/
/usr/include/GNUstep/ImbricationFilter/InsetLimit.h
/usr/include/GNUstep/OrderFilter/
/usr/include/GNUstep/OrderFilter/Order.h
/usr/include/GNUstep/ReductionFilter/
/usr/include/GNUstep/ReductionFilter/BusyArray.h
/usr/include/GNUstep/ReductionFilter/BusyDate.h
/usr/include/GNUstep/ReductionFilter/BusyNode.h
/usr/include/GNUstep/ReductionFilter/ReduceEntity.h
/usr/include/GNUstep/ReductionFilter/ReduceEntityType.h
/usr/include/GNUstep/SpaceTimeViewer/
/usr/include/GNUstep/SpaceTimeViewer/DrawView.h
/usr/include/GNUstep/SpaceTimeViewer/HierarchyRuler.h
/usr/include/GNUstep/SpaceTimeViewer/STController.h
/usr/include/GNUstep/SpaceTimeViewer/STEntityTypeLayout.h
/usr/include/GNUstep/SpaceTimeViewer/STEntityTypeLayoutController.h
/usr/include/GNUstep/SpaceTimeViewer/STLayoutEditor.h
/usr/include/GNUstep/SpaceTimeViewer/Shape.h
/usr/include/GNUstep/StatViewer/
/usr/include/GNUstep/StatViewer/PieCell.h
/usr/include/GNUstep/StatViewer/StatArray.h
/usr/include/GNUstep/StatViewer/StatViewer.h
/usr/include/GNUstep/StorageController/
/usr/include/GNUstep/StorageController/AnchorFilter.h
/usr/include/GNUstep/StorageController/Encapsulate.h