/usr/include/ is in projectcenter.app 0.6.1-1.
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/usr/include/GNUstep/
/usr/include/GNUstep/Frameworks/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/
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/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBuilder.h
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectBuilderOptions.h
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/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Versions/0.6.0/PCProjectEditor.h
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/usr/include/GNUstep/ProjectCenter
/usr/include/GNUstep/Frameworks/ProjectCenter.framework/Headers