my system is ubuntu 14, 
i have followed the steps in 
https://github.com/v8/v8/wiki/Building%20from%20Source

but an error was encountered when i running `fetch v8`, the error list here:

~/V8$ fetch v8
Running: gclient root
Running: gclient config --spec 'solutions = [
  {
    "url": "https://chromium.googlesource.com/v8/v8.git";,
    "managed": False,
    "name": "v8",
    "deps_file": "DEPS",
    "custom_deps": {},
  },
]
'
Running: gclient sync --with_branch_heads
Error: Command '/usr/bin/python 
v8/build/linux/sysroot_scripts/install-sysroot.py --running-as-hook' 
returned non-zero exit status 1 in /home/duoyi/V8
Traceback (most recent call last):
  File "/home/duoyi/V8/depot_tools/fetch.py", line 300, in <module>
    sys.exit(main())
  File "/home/duoyi/V8/depot_tools/fetch.py", line 295, in main
    return run(options, spec, root)
  File "/home/duoyi/V8/depot_tools/fetch.py", line 289, in run
    return checkout.init()
  File "/home/duoyi/V8/depot_tools/fetch.py", line 132, in init
    self.run_gclient(*sync_cmd)
  File "/home/duoyi/V8/depot_tools/fetch.py", line 76, in run_gclient
    return self.run(cmd_prefix + cmd, **kwargs)
  File "/home/duoyi/V8/depot_tools/fetch.py", line 66, in run
    return subprocess.check_output(cmd, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 573, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '('gclient', 'sync', 
'--with_branch_heads')' returned non-zero exit status 2

suggestion for this problem on internet is install curl or run gclient sync 
in v8 directory:
https://groups.google.com/forum/#!topic/v8-users/tHwdU_efJr8
but neither of them solved this problem.

the following is the error information when i run `gclient sync`

Downloading 
https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/165d7c5a152048a7ca8f55c44e0c2efae90d93dd/debian_wheezy_amd64_sysroot.tgz
Failed to download 
https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/165d7c5a152048a7ca8f55c44e0c2efae90d93dd/debian_wheezy_amd64_sysroot.tgz
Error: Command '/usr/bin/python 
v8/build/linux/sysroot_scripts/install-sysroot.py --running-as-hook' 
returned non-zero exit status 1 in /home/duoyi/V8


any one know what should i do to solve this matter? 
thanks

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