After running make distclean, one would expect all build files to be removed, but a bunch of them are still around: DerivedSources/ (and a bunch of files in there) WebCore/bindings/js/JSDOMWindowBase.lut.h WebCore/bindings/js/JSRGBColor.lut.h WebCore/bindings/js/JSXMLHttpRequest.lut.h WebCore/bindings/js/JSXSLTProcessor.lut.h WebKit/gtk/webkit/webkit-marshal.cpp WebKit/gtk/webkit/webkit-marshal.h
*** This bug has been marked as a duplicate of 18100 ***