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When setting up Erlang under OS X I have run into two issues. First, how do I keep multiple versions installed at once? I sometimes have a need to evaluate a new version of the Erlang VM while keeping the old version around “just in case.” In a few instances I had two applications which needed different versions of the VM. Second, where do I install all of the 3rd party Erlang libraries? Unlike with Ruby or Python there is no blessed “site” directory for 3rd party Erlang libraries.