def _setup_xia2_environ():
  import sys
  import os
  if not os.environ.has_key('XIA2CORE_ROOT'):
    raise RuntimeError, 'XIA2CORE_ROOT not defined'

  if not os.environ.has_key('XIA2_ROOT'):
    raise RuntimeError, 'XIA2_ROOT not defined'

  if not os.path.join(os.environ['XIA2CORE_ROOT'],
                      'Python') in sys.path:
    sys.path.append(os.path.join(os.environ['XIA2CORE_ROOT'],
                                 'Python'))

  if not os.environ['XIA2_ROOT'] in sys.path:
    sys.path.append(os.environ['XIA2_ROOT'])