system/_version_check.py

def check_version(myversion):
  def _check_one(name, expected, found):
    if expected != found:
      raise RuntimeError('Expected version '+expected+' but got '+ found            +' when loading module '+name            +'. Please make sure IMP is properly built and installed and that matching python and C++ libraries are used.')
  _check_one('system', '2.0.0', myversion)