Hi,

Currently Nyxt 2.2.4 packaged for Guix uses the gnu-build-system, which
does _not_ expose the Nyxt "systems" to ASDF.

To fix this, we should switch to the asdf-build-system, which would
require only a few changes to the recipe.

Then the nx-router recipe could be written like any other SBCL packages,
with `nyxt` as input.

Hope this helps!

Pierre