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Date: Sun, 13 Feb 2011 14:27:08 +0000
From: Bob Eager <rde@tavi.co.uk>
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Subject: Re: Makefile, ${VARIABLE}= vs. ${VARIABLE}?=
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On Sun, 13 Feb 2011 14:14:17 +0000 (UTC)
"Helmut Schneider" <jumper99@gmx.de> wrote:

> Hi,
> 
> [helmut@BSDHelmut ~]$ grep -ir latest /usr/ports/www/apache2?
> /usr/ports/www/apache20/Makefile:LATEST_LINK=   apache20
> /usr/ports/www/apache22/Makefile:LATEST_LINK?=  apache22
> [helmut@BSDHelmut ~]$
> 
> So, what's the difference between e.g. "LATEST_LINK=" and
> "LATEST_LINK?="?

As it says in the man page...

  "Assign the value to the variable if it is not already defined"