./bin/tahoe --version
Traceback (most recent call last):
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/support/bin/tahoe", line 9, in <module>
    load_entry_point('allmydata-tahoe==1.10.0', 'console_scripts', 'tahoe')()
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/setuptools-0.6c16dev4.egg/pkg_resources.py", line 318, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/setuptools-0.6c16dev4.egg/pkg_resources.py", line 2248, in load_entry_point
    return ep.load()
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/support/lib/python2.7/site-packages/setuptools-0.6c16dev4.egg/pkg_resources.py", line 1981, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/src/allmydata/scripts/runner.py", line 7, in <module>
    from allmydata.scripts.common import get_default_nodedir
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/src/allmydata/scripts/common.py", line 6, in <module>
    from allmydata.util.encodingutil import unicode_to_url, quote_output, argv_to_abspath
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/src/allmydata/util/encodingutil.py", line 65, in <module>
    _reload()
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/src/allmydata/util/encodingutil.py", line 61, in _reload
    check_encoding(io_encoding)
  File "/Users/till_old/build/allmydata-tahoe-1.10.0/src/allmydata/util/encodingutil.py", line 34, in check_encoding
    raise AssertionError("The character encoding '%s' is not supported for conversion." % (encoding,))
AssertionError: The character encoding '' is not supported for conversion.