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From: Pollywog <lists-fbsd@shadypond.com>
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Date: Sat, 28 Jul 2007 20:51:28 +0000
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Subject: Re: oops, what have i done!
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On Saturday 28 July 2007 20:23:16 Erik Trulsson wrote:

> Short answer:  It is perfectly normal.  Don't worry.
>
>
> Longer answer:
>
> The reason you have all of them installed is that some ports need one of
> them, and others need another one etc.
> It is perfectly safe to have all of them installed at the same time.
>
> You can delete any or all of them if you wish, but don't be surprised if
> they get pulled in again by one port or another.

In Linux, I occasionally have compiling problems when I have two versions of 
automake installed.  Removing the ones that are not needed fixes the problem.