Python 在Mac OS X 10.8.4上使用自制和pip安装VirtualEnv

当我使用自制+pip安装virtualenv时，会收到以下警告：

$ sudo pip install virtualenv
Downloading/unpacking virtualenv
  Downloading virtualenv-1.10.1.tar.gz (1.3MB): 1.3MB downloaded
  Running setup.py egg_info for package virtualenv

    warning: no files found matching '*.egg' under directory 'virtualenv_support'
    warning: no previously-included files matching '*' found under directory 'docs/_templates'
    warning: no previously-included files matching '*' found under directory 'docs/_build'
Installing collected packages: virtualenv
  Running setup.py install for virtualenv

    warning: no files found matching '*.egg' under directory 'virtualenv_support'
    warning: no previously-included files matching '*' found under directory 'docs/_templates'
    warning: no previously-included files matching '*' found under directory 'docs/_build'
    Installing virtualenv script to /usr/local/bin
    Installing virtualenv-2.7 script to /usr/local/bin
Successfully installed virtualenv
Cleaning up...

看起来virtualenv已经安装并开始工作（virtualenv命令工作，等等）

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然而，这些警告意味着什么？什么是virtualenv_支持？我应该担心吗？

这是Python的setuptools在安装virtualenv时发出的警告；当安装在自制之外时也会发生这种情况。这其实不是问题。

关闭Mac电脑，慢慢转身，然后拼命跑！！说真的，当它工作时，有什么问题？通常，.egg文件在easy_安装工具中使用，但是你使用了pip，所以我不在乎。