Remove the pkgs-unoptimized input to instead import regular nixpkgs.

nix/configuration/flake.lock

@@ -167,22 +167,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-unoptimized": {
-      "locked": {
-        "lastModified": 1762977756,
-        "narHash": "sha256-4PqRErxfe+2toFJFgcRKZ0UI9NSIOJa+7RXVtBhy4KE=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "c5ae371f1a6a7fd27823bc500d9390b38c05fa55",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "pre-commit-hooks-nix": {
       "inputs": {
         "flake-compat": [
@@ -215,8 +199,7 @@
         "disko": "disko",
         "impermanence": "impermanence",
         "lanzaboote": "lanzaboote",
-        "nixpkgs": "nixpkgs",
-        "nixpkgs-unoptimized": "nixpkgs-unoptimized"
+        "nixpkgs": "nixpkgs"
       }
     },
     "rust-overlay": {

nix/configuration/flake.nix

@@ -20,7 +20,6 @@
   inputs = {
     impermanence.url = "github:nix-community/impermanence";
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    nixpkgs-unoptimized.url = "github:NixOS/nixpkgs/nixos-unstable";
     lanzaboote = {
       url = "github:nix-community/lanzaboote/v0.4.2";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -35,7 +34,6 @@
     {
       self,
       nixpkgs,
-      nixpkgs-unoptimized,
       disko,
       impermanence,
       lanzaboote,
@@ -63,19 +61,12 @@
       nixosConfigs = builtins.mapAttrs (
         hostname: nodeConfig: format:
         nixpkgs.lib.nixosSystem {
-          inherit (nodeConfig) system;
           specialArgs = {
             inherit self;
 
             this_nixos_config = self.nixosConfigurations."${hostname}";
 
             all_nixos_configs = self.nixosConfigurations;
-
-            pkgs-unoptimized = import nixpkgs-unoptimized {
-              inherit (nodeConfig) system;
-              hostPlatform.gcc.arch = "default";
-              hostPlatform.gcc.tune = "default";
-            };
           };
           modules = [
             impermanence.nixosModules.impermanence
@@ -84,6 +75,21 @@
             ./configuration.nix
             (./. + "/hosts/${hostname}")
             (./. + "/formats/${format}.nix")
+            {
+              config = {
+                nixpkgs.hostPlatform.system = nodeConfig.system;
+                nixpkgs.overlays = [
+                  (final: prev: {
+                    # stable = nixpkgs-stable.legacyPackages."${prev.stdenv.hostPlatform.system}";
+                    unoptimized = import nixpkgs {
+                      system = prev.stdenv.hostPlatform.system;
+                      hostPlatform.gcc.arch = "default";
+                      hostPlatform.gcc.tune = "default";
+                    };
+                  })
+                ];
+              };
+            }
           ];
         }
       ) nodes;

nix/configuration/hosts/hydra/hardware-configuration.nix

@@ -31,6 +31,5 @@
     networking.interfaces.enp0s2.useDHCP = lib.mkForce true;
     # systemd.network.enable = true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   };
 }

nix/configuration/hosts/i_only_boot_zfs/hardware-configuration.nix

@@ -28,7 +28,6 @@
     # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
     # networking.interfaces.wlp58s0.useDHCP = lib.mkDefault true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
     hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
   };
 }

nix/configuration/hosts/neelix/hardware-configuration.nix

@@ -31,7 +31,6 @@
     # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
     # networking.interfaces.wlp58s0.useDHCP = lib.mkDefault true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
     hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
   };
 }

nix/configuration/hosts/odo/hardware-configuration.nix

@@ -28,7 +28,6 @@
     # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
     # networking.interfaces.wlp58s0.useDHCP = lib.mkDefault true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
     hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
   };
 }

nix/configuration/hosts/odowork/hardware-configuration.nix

@@ -28,7 +28,6 @@
     # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
     # networking.interfaces.wlp58s0.useDHCP = lib.mkDefault true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
     hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
   };
 }

nix/configuration/hosts/recovery/hardware-configuration.nix

@@ -28,7 +28,6 @@
     # networking.interfaces.eno1.useDHCP = lib.mkDefault true;
     # networking.interfaces.wlp58s0.useDHCP = lib.mkDefault true;
 
-    nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
     hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
   };
 }

nix/configuration/roles/optimized_build/default.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   pkgs,
-  pkgs-unoptimized,
   ...
 }:
 
@@ -68,7 +67,6 @@
           nixpkgs.hostPlatform = {
             gcc.arch = config.me.optimizations.arch;
             gcc.tune = config.me.optimizations.arch;
-            system = "x86_64-linux";
           };
 
           nixpkgs.overlays = [
@@ -99,7 +97,7 @@
               }
             )
             (final: prev: {
-              inherit (pkgs-unoptimized)
+              inherit (final.unoptimized)
                 assimp
                 binaryen
                 gsl