On Guix, I can install the hello package like this:
$ guix package -i hello
I can see that this package is available in different architectures:
$ guix package --show=hello
[...]
systems: x86_64-linux i686-linux armhf-linux aarch64-linux mips64el-linux
[...]
How can I install the hello package for a specific platform/system, say i686-linux?