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Every GHC, including the inplace one, comes with the [boot libraries](commentary/libraries). But sometimes a test case will require the installation of some packages from Hackage. There are two routes.
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## Plan A: use [ cabal install](http://hackage.haskell.org/trac/hackage/wiki/CabalInstall)
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## Plan A: use [cabal install](http://hackage.haskell.org/trac/hackage/wiki/CabalInstall)
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This method is quick and easy, but can fail if your `cabal` program is out of date with respect to the GHC version you are building. Here's how to install a library against a GHC build tree:
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