UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36

Steps to reproduce the problem:
1. Run ./bootstrap.py
2. Fails with error:
Traceback (most recent call last):
  File "bootstrap.py", line 522, in <module>
    sys.exit(main(sys.argv[1:]))
  File "bootstrap.py", line 110, in main
    return run_build(tempdir, options)
  File "bootstrap.py", line 65, in run_build
    build_gn_with_ninja_manually(tempdir, options)
  File "bootstrap.py", line 149, in build_gn_with_ninja_manually
    check_call(cmd)
  File "bootstrap.py", line 38, in check_call
    subprocess.check_call(cmd, cwd=GN_ROOT, **kwargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 535, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 522, in call
    return Popen(*popenargs, **kwargs).wait()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

What is the expected behavior?
No error, create binary for GN and BUILD.gn for itself.

What went wrong?
(Traceback copy pasted above)

Did this work before? N/A 

Chrome version: 47.0.2526.111  Channel: n/a
OS Version: OS X 10.11.4
Flash Version: Shockwave Flash 21.0 r0