text: # -----------------------------------------------------------------------------
  # Utils
  
  import errno
  import os
  import subprocess
  import shutil
  
  def version_to_ints(v):
      return [ int(x) for x in v.split('.') ]
  
  def version_lt(x, y):
      return version_to_ints(x) < version_to_ints(y)
  
  def version_le(x, y):
      return version_to_ints(x) <= version_to_ints(y)
  
  def version_gt(x, y):
      return version_to_ints(x) > version_to_ints(y)
  
  def version_ge(x, y):
      return version_to_ints(x) >= version_to_ints(y)
  
  def strip_quotes(s):
      # Don't wrap commands to subprocess.call/Popen in quotes.
      return s.strip('\'"')
  
  def getStdout(cmd_and_args):
      # Can't use subprocess.check_output as it's not available in Python 2.6;
      # It's also not quite the same as check_output, since we also verify that
      # no stderr was produced
      p = subprocess.Popen([strip_quotes(cmd_and_args[0])] + cmd_and_args[1:],
                           stdout=subprocess.PIPE,
                           stderr=subprocess.PIPE)
      (stdout, stderr) = p.communicate()
      r = p.wait()
      if r != 0:
          raise Exception("Command failed: " + str(cmd_and_args))
      if stderr:
          raise Exception("stderr from command: " + str(cmd_and_args))
      return stdout
  
  def mkdirp(path):
      try:
          os.makedirs(path)
      except OSError as e:
          if e.errno == errno.EEXIST and os.path.isdir(path):
              pass
          else:
              raise
  
  def lndir(srcdir, dstdir):
      # Create symlinks for all files in src directory.
      # Not all developers might have lndir installed.
      # os.system('lndir -silent {0} {1}'.format(srcdir, dstdir))
      for filename in os.listdir(srcdir):
          src = os.path.join(srcdir, filename)
          dst = os.path.join(dstdir, filename)
          if os.path.isfile(src):
              link_or_copy_file(src, dst)
          else:
              os.mkdir(dst)
              lndir(src, dst)
  
  # On Windows, os.symlink is not defined. Except when using msys2, as ghc
  # does. Then it copies the source file, instead of creating a symbolic
  # link to it. We define the following function to make this magic more
  # explicit/discoverable. You are enouraged to use it instead of
  # os.symlink.
  link_or_copy_file = getattr(os, "symlink", shutil.copyfile)
  