Chromium's depot_tools do not work on FreeBSD which causes the build of v8 6.2+ to fail #253

[vagrant@ ~]$ 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

v8 (ERROR)
----------------------------------------
[0:00:00] Started.
[0:00:00] 

________ running 'git -c core.deltaBaseCacheLimit=2g clone --no-checkout --progress https://chromium.googlesource.com/v8/v8.git /home/vagrant/_gclient_v8_QyrTf0' in '/home/vagrant'
[0:00:00] Cloning into '/home/vagrant/_gclient_v8_QyrTf0'...
[0:00:03] remote: Sending approximately 527.03 MiB ...        
[0:00:04] remote: Counting objects: 1           
[0:00:04] remote: Counting objects: 7660, done        
[0:01:34] Receiving objects: 100% (515515/515515), 526.45 MiB | 5.84 MiB/s, done.
[0:01:34] remote: Total 515515 (delta 421712), reused 515515 (delta 421712)        
[0:02:43] Resolving deltas: 100% (421712/421712), done.
[0:03:02] From https://chromium.googlesource.com/v8/v8
[0:03:02]  * [new ref]               refs/branch-heads/0.1         -> branch-heads/0.1
[0:03:02]  * [new ref]               refs/branch-heads/0.3         -> branch-heads/0.3
[0:03:02]  * [new ref]               refs/branch-heads/1.1         -> branch-heads/1.1
[0:03:02]  * [new ref]               refs/branch-heads/1.2         -> branch-heads/1.2
[0:03:02]  * [new ref]               refs/branch-heads/1.3         -> branch-heads/1.3
[0:03:02]  * [new ref]               refs/branch-heads/2.0         -> branch-heads/2.0
[0:03:02]  * [new ref]               refs/branch-heads/2.1         -> branch-heads/2.1
[0:03:02]  * [new ref]               refs/branch-heads/2.2         -> branch-heads/2.2
[0:03:02]  * [new ref]               refs/branch-heads/2.3         -> branch-heads/2.3
[0:03:02]  * [new ref]               refs/branch-heads/2.4         -> branch-heads/2.4
[0:03:02]  * [new ref]               refs/branch-heads/2.5         -> branch-heads/2.5
[0:03:02]  * [new ref]               refs/branch-heads/3.0         -> branch-heads/3.0
[0:03:02]  * [new ref]               refs/branch-heads/3.1         -> branch-heads/3.1
[0:03:02]  * [new ref]               refs/branch-heads/3.10        -> branch-heads/3.10
[0:03:02]  * [new ref]               refs/branch-heads/3.11        -> branch-heads/3.11
[0:03:02]  * [new ref]               refs/branch-heads/3.12        -> branch-heads/3.12
[0:03:02]  * [new ref]               refs/branch-heads/3.13        -> branch-heads/3.13
[0:03:02]  * [new ref]               refs/branch-heads/3.14        -> branch-heads/3.14
[0:03:02]  * [new ref]               refs/branch-heads/3.15        -> branch-heads/3.15
[0:03:02]  * [new ref]               refs/branch-heads/3.16        -> branch-heads/3.16
[0:03:02]  * [new ref]               refs/branch-heads/3.17        -> branch-heads/3.17
[0:03:02]  * [new ref]               refs/branch-heads/3.18        -> branch-heads/3.18
[0:03:02]  * [new ref]               refs/branch-heads/3.19        -> branch-heads/3.19
[0:03:02]  * [new ref]               refs/branch-heads/3.2         -> branch-heads/3.2
[0:03:02]  * [new ref]               refs/branch-heads/3.20        -> branch-heads/3.20
[0:03:02]  * [new ref]               refs/branch-heads/3.20.15.5   -> branch-heads/3.20.15.5
[0:03:02]  * [new ref]               refs/branch-heads/3.21        -> branch-heads/3.21
[0:03:02]  * [new ref]               refs/branch-heads/3.22        -> branch-heads/3.22
[0:03:02]  * [new ref]               refs/branch-heads/3.23        -> branch-heads/3.23
[0:03:02]  * [new ref]               refs/branch-heads/3.24        -> branch-heads/3.24
[0:03:02]  * [new ref]               refs/branch-heads/3.25        -> branch-heads/3.25
[0:03:02]  * [new ref]               refs/branch-heads/3.26        -> branch-heads/3.26
[0:03:02]  * [new ref]               refs/branch-heads/3.27        -> branch-heads/3.27
[0:03:02]  * [new ref]               refs/branch-heads/3.28        -> branch-heads/3.28
[0:03:02]  * [new ref]               refs/branch-heads/3.29        -> branch-heads/3.29
[0:03:02]  * [new ref]               refs/branch-heads/3.3         -> branch-heads/3.3
[0:03:02]  * [new ref]               refs/branch-heads/3.30        -> branch-heads/3.30
[0:03:02]  * [new ref]               refs/branch-heads/3.31        -> branch-heads/3.31
[0:03:02]  * [new ref]               refs/branch-heads/3.4         -> branch-heads/3.4
[0:03:02]  * [new ref]               refs/branch-heads/3.5         -> branch-heads/3.5
[0:03:02]  * [new ref]               refs/branch-heads/3.6         -> branch-heads/3.6
[0:03:02]  * [new ref]               refs/branch-heads/3.7         -> branch-heads/3.7
[0:03:02]  * [new ref]               refs/branch-heads/3.8         -> branch-heads/3.8
[0:03:02]  * [new ref]               refs/branch-heads/3.9         -> branch-heads/3.9
[0:03:02]  * [new ref]               refs/branch-heads/4.1         -> branch-heads/4.1
[0:03:02]  * [new ref]               refs/branch-heads/4.2         -> branch-heads/4.2
[0:03:02]  * [new ref]               refs/branch-heads/4.2.39      -> branch-heads/4.2.39
[0:03:02]  * [new ref]               refs/branch-heads/4.3         -> branch-heads/4.3
[0:03:02]  * [new ref]               refs/branch-heads/4.4         -> branch-heads/4.4
[0:03:02]  * [new ref]               refs/branch-heads/4.5         -> branch-heads/4.5
[0:03:02]  * [new ref]               refs/branch-heads/4.6         -> branch-heads/4.6
[0:03:02]  * [new ref]               refs/branch-heads/4.7         -> branch-heads/4.7
[0:03:02]  * [new ref]               refs/branch-heads/4.8         -> branch-heads/4.8
[0:03:02]  * [new ref]               refs/branch-heads/4.9         -> branch-heads/4.9
[0:03:02]  * [new ref]               refs/branch-heads/5.0         -> branch-heads/5.0
[0:03:02]  * [new ref]               refs/branch-heads/5.1         -> branch-heads/5.1
[0:03:02]  * [new ref]               refs/branch-heads/5.2         -> branch-heads/5.2
[0:03:02]  * [new ref]               refs/branch-heads/5.3         -> branch-heads/5.3
[0:03:02]  * [new ref]               refs/branch-heads/5.4         -> branch-heads/5.4
[0:03:02]  * [new ref]               refs/branch-heads/5.5         -> branch-heads/5.5
[0:03:02]  * [new ref]               refs/branch-heads/5.6         -> branch-heads/5.6
[0:03:02]  * [new ref]               refs/branch-heads/5.7         -> branch-heads/5.7
[0:03:02]  * [new ref]               refs/branch-heads/5.8         -> branch-heads/5.8
[0:03:02]  * [new ref]               refs/branch-heads/5.9         -> branch-heads/5.9
[0:03:02]  * [new ref]               refs/branch-heads/6.0         -> branch-heads/6.0
[0:03:02]  * [new ref]               refs/branch-heads/6.1         -> branch-heads/6.1
[0:03:02]  * [new ref]               refs/branch-heads/6.2         -> branch-heads/6.2
[0:03:02]  * [new ref]               refs/branch-heads/6.3         -> branch-heads/6.3
[0:03:02]  * [new ref]               refs/branch-heads/6.4         -> branch-heads/6.4
[0:03:02]  * [new ref]               refs/branch-heads/experimental -> branch-heads/experimental
[0:03:02]  * [new ref]               refs/branch-heads/test-gnumbd -> branch-heads/test-gnumbd
[0:03:07] Checked out refs/remotes/origin/master to a detached HEAD. Before making any commits
in this repo, you should use 'git checkout <branch>' to switch to
an existing branch or use 'git checkout origin -b <branch>' to
create a new branch for your work.
[0:03:07]
----------------------------------------
Traceback (most recent call last):
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 2679, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 2665, in main
    return dispatcher.execute(OptionParser(), argv)
  File "/home/vagrant/libv8/vendor/depot_tools/subcommand.py", line 252, in execute
    return command(parser, args[1:])
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 2420, in CMDsync
    ret = client.RunOnDeps('update', args)
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 1497, in RunOnDeps
    work_queue.flush(revision_overrides, command, args, options=self._options)
  File "/home/vagrant/libv8/vendor/depot_tools/gclient_utils.py", line 1059, in run
    self.item.run(*self.args, **self.kwargs)
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 903, in run
    self.ParseDepsFile()
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 721, in ParseDepsFile
    for key, value in self.parent.get_vars().iteritems():
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 1191, in get_vars
    'host_os': _detect_host_os(),
  File "/home/vagrant/libv8/vendor/depot_tools/gclient.py", line 1209, in _detect_host_os
    return _PLATFORM_MAPPING[sys.platform]
KeyError: 'freebsd11'
Traceback (most recent call last):
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 301, in <module>
    sys.exit(main())
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 296, in main
    return run(options, spec, root)
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 290, in run
    return checkout.init()
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 133, in init
    self.run_gclient(*sync_cmd)
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 78, in run_gclient
    return self.run(cmd_prefix + cmd, **kwargs)
  File "/home/vagrant/libv8/vendor/depot_tools/fetch.py", line 68, in run
    return subprocess.check_output(cmd, **kwargs)
  File "/usr/local/lib/python2.7/subprocess.py", line 219, in check_output
    raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '('gclient', 'sync', '--with_branch_heads')' returned non-zero exit status 1