Hello webkit-dev, i check out the source code of version 25773 from http://svn.webkit.org/repository/webkit/trunk, try to build it, then i got following error: g++ -c -o obj-gnu/webcore_gdk_CSSGrammar.o -I../../../JavaScriptCore -I../.. -I../../bindings/js -I../../bridge -I../../css -I../../DerivedSources/WebCore -I../../dom -I../../editing -I../../ForwardingHeaders/kjs -I../../history -I../../html -I../../include -I../../loader -I../../loader/gdk -I../../loader/icon -I../../page -I../../platform -I../../platform/graphics -I../../platform/graphics/gdk -I../../platform/image-decoders -I../../platform/image-decoders/bmp -I../../platform/image-decoders/gif -I../../platform/image-decoders/ico -I../../platform/image-decoders/jpeg -I../../platform/image-decoders/png -I../../platform/image-decoders/xbm -I../../platform/image-decoders/zlib -I../../platform/network -I../../platform/network/gdk -I../../rendering -I../../xml -DENABLE_XSLT=1 -DLINUX -DUSE_CONSERVATIVE_GC=0 -DHAVE_FUNC_ISNAN -D_THREAD_SAFE -pthread -g -I../../platform/gdk -I../../platform/network/gdk -DBUILDING_GDK__ -DBUILDING_CAIRO__ -Iplatform/gdk -Iplatform/graphics/cairo -DENABLE_XPATH -I/usr/include/libxml2 -I/usr/include/libxml2 -g -O2 -I/usr/include/freetype2 -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0-I/usr/include/glib- 2.0 -I/usr/lib/glib-2.0/include -I/usr/include/cairo -fPIC -DPIC -fno-rtti -fno-exceptions -MTobj-gnu/webcore_gdk_CSSGrammar.o -MF`echo obj-gnu/webcore_gdk_CSSGrammar.o | sed -e 's,\.o$,.d,'` -MD ../../DerivedSources/WebCore/CSSGrammar.cpp /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y: In function 'int WebCore::getPropertyID(const char*, int)': /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:86: error：'findProp': identifier not found /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:90: error：invalid use of undefined type 'const struct WebCore::props' /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:86: error：forward declaration of 'const struct WebCore::props' /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y: In function 'int getValueID(const char*, int)': /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:111: error：'findValue' identifier not found /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:115: error：invalid use of undefined type 'const struct css_value' /home/michelle/Study/Webkit/trunk/WebCore/css/CSSGrammar.y:111: error：forward declaration of 'const struct css_value' make: *** [obj-gnu/webcore_gdk_CSSGrammar.o] error1 and i tried to find the definition of 'findProp' and 'findValue' in the entitre directory, but i failed to find it. also i have found that similiar bugs already reported, with the bug id 9340 and 14841, but no solution found. could you tell me how to fix this problem or how to avoid it? i really appreciate if you could give me some hint. thank you! PS , my building step is like this cd WebKitTools/Scripts sudo ./install-unix-extras cd JavaScriptCore make cd .. cd WebCore/Projects/gdk/ make thank you and regards! michelle