I've already solved this via a different way, but it's still an
interesting question I guess.

I think the only way to do it is via specifying #:system in arguments
for an input to force it to build for a certain architecture?

On Sat, 30 Dec 2017 17:15:53 +0100
Rutger Helling <rhelling@mykolab.com> wrote:

> Hey Guix,
> 
> is it possible to specify a specific architecture for an input? I'm
> trying to build Wine with WOW64 (meaning both 32-bit and 64-bit 
> support at once), however this requires that I need access to both
> 32-bit and 64-bit (i686/x86_64) inputs.