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From: Anonymous <swell.k@gmail.com>
To: Chris Rees <utisoft@gmail.com>
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Date: Sun, 13 Feb 2011 19:22:08 +0300
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	(Chris Rees's message of "Sun, 13 Feb 2011 14:44:03 +0000")
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Cc: Helmut Schneider <jumper99@gmx.de>, freebsd-ports@freebsd.org
Subject: Re: Makefile, ${VARIABLE}= vs. ${VARIABLE}?=
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Chris Rees <utisoft@gmail.com> writes:

> On 13 February 2011 14:14, 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?="?

Slave ports use different LATEST_LINK, e.g. www/apache22-worker-mpm.

> ?= can be overridden in make.conf or on the command line.

`=' and `:=' can be overriden via command line, too.

> = clobbers all previous definitions.