前提，安装brew
第一步：brew update
第二步(例子)：
- Find the library you're looking for at :
https://github.com/mxcl/homebrew/tree/master/Library/Formula - Click it: https://github.com/mxcl/homebrew/blob/master/Library/Formula/postgresql.rb
- Click the "history" button to look at old commits: https://github.com/mxcl/homebrew/commits/master/Library/Formula/postgresql.rb
- Click the one you want: "postgresql: update version to 8.4.4"
- Click the "raw" button: https://raw.github.com/mxcl/homebrew/fa992c6a82eebdc4cc36a0c0d2837f4c02f3f422/Library/Formula/postgresql.rb
- Input command：
brew install https://raw.github.com/mxcl/homebrew/fa992c6a82eebdc4cc36a0c0d2837f4c02f3f422/Library/Formula/postgresql.rb
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