text: import os
  import re
  from subprocess import Popen, PIPE
  
  def find_command(cmd, path=None, pathext=None):
      if path is None:
          path = os.environ.get('PATH', []).split(os.pathsep)
      if isinstance(path, basestring):
          path = [path]
      # check if there are funny path extensions for executables, e.g. Windows
      if pathext is None:
          pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)
      # don't use extensions if the command ends with one of them
      for ext in pathext:
          if cmd.endswith(ext):
              pathext = ['']
              break
      # check if we find the command on PATH
      for p in path:
          f = os.path.join(p, cmd)
          if os.path.isfile(f):
              return f
          for ext in pathext:
              fext = f + ext
              if os.path.isfile(fext):
                  return fext
      return None
  
  # checks if it can find xgettext on the PATH and
  # imports the extraction tests if yes
  xgettext_cmd = find_command('xgettext')
  if xgettext_cmd:
      p = Popen('%s --version' % xgettext_cmd, shell=True, stdout=PIPE, stderr=PIPE, close_fds=os.name != 'nt', universal_newlines=True)
      output = p.communicate()[0]
      match = re.search(r'(?P<major>\d+)\.(?P<minor>\d+)', output)
      if match:
          xversion = (int(match.group('major')), int(match.group('minor')))
          if xversion >= (0, 15):
              from extraction import *
      del p
  