$ python setup.py install

running install
Building lexer and parser tables.
Traceback (most recent call last):
  File "setup.py", line 130, in <module>
    main()
  File "setup.py", line 123, in main
    setup(**skw)
  File "/usr/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "setup.py", line 44, in run
    build_tables()
  File "setup.py", line 37, in build_tables
    outputdir='xonsh')
  File "/home/simon/src/gitsome/xonsh/parser.py", line 233, in __init__
    self.parser = yacc.yacc(**yacc_kwargs)
  File "/usr/lib/python3.6/site-packages/ply/yacc.py", line 3424, in yacc
    raise YaccError('Unable to build parser')
ply.yacc.YaccError: Unable to build parser

$ python 
Python 3.6.0 (default, Jan 16 2017, 12:12:55) 
[GCC 6.3.1 20170109] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ply
>>> ply.__version__
'3.9'