/usr/include/GNUstep/ is in projectcenter.app 0.6.1-1.
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..
/usr/include/GNUstep/Frameworks/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Headers
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCAddFilesPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCBundleManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCDefines.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCEditorManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCFileCreator.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCFileManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCFileNameField.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCFileNameIcon.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCLogController.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCMakefileFactory.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProject.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBrowser.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBuilder.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBuilderOptions.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBuilderPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectEditor.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectInspector.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectLauncher.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectLauncherPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectLoadedFiles.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectLoadedFilesPanel.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectManager.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectWindow.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCSaveModified.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/ProjectCenter.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/Protocols/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/Protocols/CodeDebugger.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/Protocols/CodeEditor.h
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/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/Protocols/Preferences.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/Protocols/ProjectType.h
/usr/include/GNUstep/ProjectCenter