安装在Ubuntu virtualenv上的pip安装错误。

I have an ec2 instance and had Pillow 2.0 installed in my virtualenv initially. Somehow when I tried to upgrade it to Pillow 2.5, it failed with the following message. The error is the same even after I removed Pillow completely prior to reinstall. (So now I don't have Pillow in my virtualenv at all)I have an ec2 instance and had Pillow 2.0 insta