code: def install_lib(url, replace_existing=False, fix_wprogram=True):
      
      d = tmpdir(tmpdir())
      f = download(url)
      Archive(f).extractall(d)
  
      clean_dir(d)
      d, src_dlib = find_lib_dir(d)
      move_examples(d, src_dlib)
      fix_examples_dir(src_dlib)
      if fix_wprogram:
          fix_wprogram_in_files(src_dlib)
  
      targ_dlib = libraries_dir() / src_dlib.name
      if targ_dlib.exists():
          log.debug('library already exists: %s', targ_dlib)
          if replace_existing:
              log.debug('remove %s', targ_dlib)
              targ_dlib.rmtree()
          else:
              raise ConfduinoError('library already exists:' + targ_dlib)
  
      log.debug('move %s -> %s', src_dlib, targ_dlib)
      src_dlib.move(targ_dlib)
  
      libraries_dir().copymode(targ_dlib)
      for x in targ_dlib.walk():
          libraries_dir().copymode(x)
      return targ_dlib.name
docs: install library from web or local files system.
  
      :param url: web address or file path
      :param replace_existing: bool
      :rtype: None