I have been struggling for a couple of days to get the correct incantations 
to get a build of v8 working on windows 10 with visual studio 2015.

In short the steps that i've been attempting are as follows

   - set DEPOT_TOOLS_WIN_TOOLCHAIN=0
   - set GYP_MSVS_VERSION=2015
   - set GYP_GENERATORS=msvs-ninja,ninja
   - Get depot tools from: wget 
   https://storage.googleapis.com/chrome-infra/depot_tools.zip -OutFile 
   depot_tools.zip
   - Expand Archive: Expand-Archive .\depot_tools.zip -dest depot_tools
   - Set the path for depot tools
   - Checkout the v8 source code by running: fetch v8
   - Change directory to /v8 and checkout 5.2: git checkout branch-heads/5.2
   - Run sync so that all the dependencies are up to date with the branch: 
gclient 
   sync
   - To generate the project files run: third_party/python_26/python.exe 
   build\gyp_v8 -Dtarget_arch=x64
   - To build: : "c:\Program Files (x86)\Microsoft Visual Studio 
   14.0\Common7\IDE\devenv.com" /build Release gypfiles\All.sln
   
I am running into all kinds of issues related with the build and after 
running the last command it ends with

The first occurrence of the error is 

1>  ninja -t msvc -e environment.x64 -- "C:\Program Files (x86)\Microsoft 
Visual Studio 14.0\VC\bin\amd64\cl.exe" /nologo /showIncludes /FC @obj\
third_party\icu\source\i18n\icui18n.collationkeys.obj.rsp /c ..\..\
third_party\icu\source\i18n\collationkeys.cpp /Foobj\third_party\icu\source\
i18n\icui18n.collationkeys.obj /Fdobj\third_party\icu\icui18n.cc.pdb
1>C:\source\EventStore\v8build\v8\third_party\icu\source\i18n\collationkeys.cpp 
: fatal error C1083: Cannot open compiler generated file: 
'C:\source\EventStore\v8build\v8\out\Release_x64\obj\third_party\icu\source\i18n\icui18n.collationkeys.obj'
: Permission denied

I am not sure why i'm getting a permission denied.

the build then ends with

40>  ninja: build stopped: subcommand failed.
40>ninja : warning : premature end of file; recovering
40>C:\source\v8build\v8\test\fuzzer\wasm_fuzzer.vcxproj(334,5): error 
MSB3073: The command "call ninja.exe -C ..\..\out\Release_x64\ wasm_fuzzer" 
exited with code 1.

 ..\..\out\Release_x64\ wasm_fuzzer" exited with code 1.
========== Build: 20 succeeded, 21 failed, 0 up-to-date, 0 skipped 
==========


Any help would be much appreciated

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