Date: Sun, 13 Feb 2011 15:57:47 +0100
From: Gary Jennejohn <gljennjohn@googlemail.com>
To: "Helmut Schneider" <jumper99@gmx.de>
Cc: freebsd-ports@freebsd.org
Subject: Re: Makefile, ${VARIABLE}= vs. ${VARIABLE}?=
Message-ID: <20110213155747.34adbb9f@ernst.jennejohn.org>
In-Reply-To: <xn0habnig1jczkg007@news.gmane.org>
References: <xn0habnig1jczkg007@news.gmane.org>
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On Sun, 13 Feb 2011 14:14:17 +0000 (UTC)
"Helmut Schneider" <jumper99@gmx.de> wrote:
> [helmut@BSDHelmut ~]$ 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?="?
>
from make(1)
= Assign the value to the variable. Any previous value is overrid-
den.
?= Assign the value to the variable if it is not already defined.
--
Gary Jennejohn
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