/usr/include/ is in projectcenter.app 0.6.2-1ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/GNUstep/Frameworks/
/usr/include/GNUstep/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCAddFilesPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCAuxiliaryWindow.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCBundleManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCDefines.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCEditorManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCFileCreator.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCFileManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCFileNameField.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCFileNameIcon.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCLogController.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCMakefileFactory.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProject.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectBrowser.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectBuilder.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectBuilderOptions.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectBuilderPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectEditor.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectInspector.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectLauncher.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectLauncherPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectLoadedFiles.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectLoadedFilesPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCProjectWindow.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/PCSaveModified.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/ProjectCenter.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/CodeDebugger.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/CodeEditor.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/CodeEditorView.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/CodeParser.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/Preferences.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.2/Protocols/ProjectType.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Headers
/usr/include/GNUstep/ProjectCenter