Okay so some improvements are coming to the zig-build-system #zig in #guix
I prepared support for tunable packages so we can choose what cpu we want to build for, and I also sent a patch for cross-compilation support (I tested it in aarch64 and it works).
Next is to add zig-0.11.0 to guix but that's going to take a little bit longer because I have some tests failing for Mach-O and I don't know why they fail.
Good stuff.