nixpkgs.hostPlatform: set as default, to allow hosts to customize it later

flake.nix

@@ -116,10 +116,12 @@
                   self.overlays.pkgs
                   # self.overlays.optimizations
                 ];
-                nixpkgs.hostPlatform = target;
+              }
+              ({ lib, ... }: {
+                nixpkgs.hostPlatform = lib.mkDefault target;
                 # nixpkgs.buildPlatform = local;  # set by instantiate.nix instead
                 # nixpkgs.config.replaceStdenv = { pkgs }: pkgs.ccacheStdenv;
-              }
+              })
             ];
           });
     in {

hosts/instantiate.nix

@@ -4,7 +4,7 @@
 { hostName, localSystem }:
 
 # module args
-{ config, lib, ... }:
+{ lib, ... }:
 
 {
   imports = [
@@ -16,14 +16,4 @@
   networking.hostName = hostName;
   nixpkgs.buildPlatform = lib.mkIf (localSystem != null) localSystem;
   sane.cross.enablePatches = localSystem != null;
-
-  # nixpkgs.overlays = [
-  #   (next: prev: {
-  #     # for local != target we by default just emulate the target while building.
-  #     # provide a `pkgs.cross.<pkg>` alias that consumers can use instead of `pkgs.<foo>`
-  #     # to explicitly opt into non-emulated cross compilation for any specific package.
-  #     # this is most beneficial for large packages with few pre-requisites -- like Linux.
-  #     cross = prev.crossFrom."${localSystem}";
-  #   })
-  # ];
 }