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到haskell官方下载haskell的工具包：
https://downloads.haskell.org/~platform/2014.2.0.0/Haskell%20Platform%202014.2.0.0%2064bit.signed.pkg
adeMacBook-Pro:haskell_dev apple$ ghci GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> putStrLn "Hello World" Hello World Prelude>
参考文档：
http://rwh.readthedocs.org/en/latest/chp/1.html
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原文地址：http://www.cnblogs.com/super-d2/p/4510639.html
