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V8Update.cmd fails on Windows 7 x64 (missing dependencies)
Due to a missing dependency (icu46 revision 214189) the V8Update.cmd process fails.
Also, the version of GYP specified by the Google V8 Project (within the dependencies: target of the official make file) is revision 1685. By using the latest python errors are generated referencing forking.py from the multiprocess package.
Also the official make file specifies revision 89111 of the python_26 "third_party" tool.
Only after applying the above changes was it possible to successfully build the v8 (ia32/x64) binaries (*.dll)
I have attached a patch file including my changes.