add deepseq instruction
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README.md
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README.md
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## Installing the latest development version from github
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If you are concerned about mucking with your installed packages, you might try using the new [virthualenv](http://hackage.haskell.org/package/virthualenv) tool to isolate a custom yesod build to a particular application.
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Currently there is a very annoying issue that aeson, a Yesod dependency requires deepseq < 1.2
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A new version of aeson should be released fairly soon.
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This means that before installing Yesod you should
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~~~
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cabal install deepseq-1.1.0.2
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~~~
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To ensure that cabal prefers this package you need to first start from a clean slate.
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The easiest way to do that is to use [virthualenv](http://hackage.haskell.org/package/virthualenv), which will prevent any conflicts with presently installed packages by creating an isolated install environment.
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~~~
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cabal install virthualenv
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mkdir yesodweb
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cd yesodweb
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virthualenv --name=yesod
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~~~
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Yesod is broken up into 4 separate repos and built upon many smaller packages.
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All of them can be installed with the below command.
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