Mac OS: remove old erlang installation [closed]

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I am using Mac OS Snow leopard and installed erlang from source (R13B04). Now I started using mac ports system to manage software. 开发者_StackOverflowThis port utility installed a newer version of erlang (R14A) runtime during the set up of rabbitmq server. But it looks like when I start rabbitmq it is using the old erlang run time and causing problems.

What is the best way to remove the old erlang installation? Can I just delete those old directories?