make upgrade overwrites /etc/mail/mailer.conf

[David Cuthbert]

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Matthew Dillon wrote:
>     I don't think it's necessary that we support service removal
>     immediately, but if we were to do it I would suggest something like
>     '-<servicename> ...' in /etc/services to remove a service entirely.

Oof.  This misses the (common) case where an upgrade adds a service I 
don't want.  I didn't remove it because I was unaware of it before.

I'm somewhat fond of the way portage handles this (or, at least, is 
supposed to): modify an example configuration file which is used for 
reference only.  /etc/make.conf, for example, is never touched; 
upgrading portage modifies /etc/make.conf.example.

Dave