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Date: Mon, 6 Feb 2012 21:00:40 +0100
From: Michael Olbrich <m.olbrich@pengutronix.de>
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Subject: Re: [ptxdist] How to deal with "alternatives"
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Hi,

On Sun, Feb 05, 2012 at 11:18:10PM +0100, Erwin Rol wrote:
> I was wondering how I can deal with "alternatives" packages?
> I have a nVidia BLOB driver for Tegra 2 OpenGL ES. That drivers
> brings the OpenGL libs that are needed by 3d programs. But those
> programs all "select" MESALIB which brings the opensource OpenGL
> libraries.
> 
> So how can I deal with two (or more) packages that offer feature XYZ
> that is needed by other packages?

There is no generic solution for this. In your case I'd suggest a dummy
mesalib package, that redirects the dependency to your OpenGL package:
A makefile with just "PACKAGES-$(PTXCONF_MESALIB) += mesalib" and an
in-file that selects your package.
However, this won't generate any ipkg dependencies. A solution for this is
on the todo list, but so far not implemented.

Michael

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