if build release webkit-1.3.10 with --enable-web-audio
then have error:
Source/WebCore/bindings/js/JSEventCustom.cpp:104:34: fatal error: AudioProcessingEvent.h: No such file or directory
Committed r76960: <http://trac.webkit.org/changeset/76960>
I fixed the missing files from the source distribution, but keep in mind that web audio is at a very early state right now.