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@@ -51,6 +51,18 @@ Rubinius can also be cloned via github:
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   git clone git://github.com/evanphx/rubinius.git rubinius
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+== Getting the RubySpec submodules
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+
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+You need to fetch the source for MSpec and the RubySpec submodules manually.
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+After running 'git clone' above, run:
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+
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+  rake spec:update
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+
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+The spec:update task is also a dependency of the git:update task. So, if you
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+use the rake tasks for updating your Rubinius sources, the MSpec and RubySpec
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+source will automatically be updated. If you use the git commands manually,
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+you will need to run rake spec:update also.
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+
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 == Compiling Rubinius
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 Once you have all the prerequisites installed, building rubinius is as simple