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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
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Date: Wed, 6 May 2009 17:40:41 +0200
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Cc: Anton Shterenlikht <mexas@bristol.ac.uk>
Subject: Re: make - reassign variable using if-then ?
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On Wednesday 06 May 2009 11:31:17 Anton Shterenlikht wrote:

> I'm trying to build gcc43 on alpha 6.4.
> In /usr/ports/lang/gcc43/Makefile I have:
>
> # grep NOT_FOR_ARCHS /usr/ports/lang/gcc43/Makefile
> NOT_FOR_ARCHS=  alpha ia64 powerpc
> #
>
> In /etc/make.conf I have:
>
> .if ${.CURDIR:M*/lang/gcc43*}
> NOT_FOR_ARCHS= ia64
> USE_GCC=4.3+
> .endif
>
> This used to work fine until some update. Not anymore.
> The second setting is being used, i.e. the port is being built
> with gcc43. But the NOT_FOR_ARCHS is not changed, so I have
> to do it manually each time.
>
> So I tried to experiment with changing variable values withing if-then.

Your only option is overriding in /usr/portslang/gcc43/Makefile.local. This is 
because make.conf is read *before* the Makefile and the Makefile simply 
overrides your values. Makefile.local is read *after* the Makefile.
csup will leave it alone, however portsnap will delete the entire directory 
before upgrading the port, so your Makefile.local will be shot.
-- 
Mel