diff --git a/flake.nix b/flake.nix
index 1a20e9e..7ab10c5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,15 +16,24 @@
         "${namespace}" = builtins.removeAttrs overlayPkgs ["override"];
       }
       // (overlayPkgs.override or {});
+
+    doctrineNoPkgs = self.lib.mkDoctrine {
+      lib = nixpkgs.lib;
+      pkgs = null;
+    };
   in
-    flake-utils.lib.eachDefaultSystem (system: {
-      formatter = (import nixpkgs {inherit system;}).alejandra;
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {inherit system;};
+    in {
+      formatter = pkgs.alejandra;
 
       packages =
         (import nixpkgs {
           inherit system;
-          overlays = [(mapOverlayOverride "local" (import ./pkgs))];
-        }).local;
+          overlays = [(mapOverlayOverride doctrineNoPkgs.prefix (import ./pkgs))];
+        }).${
+          doctrineNoPkgs.prefix
+        };
     })
     // {
       templates = let
@@ -39,33 +48,37 @@
       };
 
       overlays = let
-        overlay = mapOverlayOverride "trivium" (import ./pkgs);
+        overlay = mapOverlayOverride doctrineNoPkgs.prefix (import ./pkgs);
       in {
         default = overlay;
-        trivium = overlay;
+        ${doctrineNoPkgs.prefix} = overlay;
       };
 
       homeManagerModules.default = ./modules;
       nixosModules.default = ./modules;
 
       lib = {
+        mkDoctrine = import ./doctrine;
+
         mkSystemFlake = {
           flakes,
           system,
+          doctrinePrefix ? null,
           formatter ? "alejandra",
-          localOverlayPath ? /. + "${flakes.self}" + /pkgs,
-          nixpkgsConfigPath ? localOverlayPath + /config,
-          nixosSourcePath ? /. + "${flakes.self}" + /sys,
-          nixosPlatformsPath ?
-            if nixosSourcePath != null
-            then nixosSourcePath + /platform
-            else null,
-          hmSourcePath ? /. + "${flakes.self}" + /home,
-          hmPlatformsPath ?
-            if hmSourcePath != null
-            then hmSourcePath + /platform
-            else null,
+          paths ? {},
         }: let
+          mkDoctrine = args:
+            self.lib.mkDoctrine
+            (args
+              // optionalAttrs (doctrinePrefix != null) {
+                prefix = doctrinePrefix;
+              });
+
+          doctrineNoPkgs = mkDoctrine {
+            lib = nixpkgs.lib;
+            pkgs = null;
+          };
+
           optionalFlake = name:
             if flakes ? "${name}"
             then flakes.${name}
@@ -74,7 +87,7 @@
           requireFlake = name:
             if flakes ? "${name}"
             then flakes.${name}
-            else throw "Required flake input '${name}' is required but was not provided";
+            else throw "Required flake input '${name}' is missing";
 
           nur = optionalFlake "nur";
           nixpkgs = requireFlake "nixpkgs";
@@ -85,13 +98,21 @@
             then requireFlake "home-manager"
             else null;
 
+          pathFromSelf = path: builtins.toPath "${flakes.self}" + "/${path}";
+
+          localOverlayPath = pathFromSelf paths.localOverlay;
+          nixpkgsConfigPath = pathFromSelf paths.nixpkgsConfig;
+          nixosSourcePath = pathFromSelf paths.nixosSource;
+          nixosPlatformsPath = pathFromSelf paths.nixosPlatforms;
+          hmSourcePath = pathFromSelf paths.hmSource;
+          hmPlatformsPath = pathFromSelf paths.hmPlatforms;
+
           pkgs = importPkgs nixpkgs;
 
           importPkgs = flake:
             import flake ({
                 inherit system;
 
-                config = import ./pkgs/config nixpkgs.lib;
                 overlays = let
                   conditions = [
                     {
@@ -100,7 +121,7 @@
                     }
                     # NB: Preserve the relative order
                     {
-                      overlay = self.overlays.trivium;
+                      overlay = self.overlays.default;
                       condition = true;
                     }
                     {
@@ -111,87 +132,87 @@
                 in
                   builtins.map (cond: cond.overlay) (builtins.filter (cond: cond.condition) conditions);
               }
-              // (
-                if nixpkgsConfigPath != null
-                then {
-                  config = import nixpkgsConfigPath {inherit (nixpkgs) lib;};
-                }
-                else {}
-              ));
+              // optionalAttrs (paths ? nixpkgsConfig) {
+                config = import nixpkgsConfigPath {inherit (nixpkgs) lib;};
+              });
 
-          inherit (pkgs.trivium.lib) importAll;
+          inherit (pkgs) lib;
+          inherit (nixpkgs.lib) optionalAttrs; # Prevents infinite recursion
+          inherit (doctrineNoPkgs) prefix;
+          inherit (doctrineNoPkgs.lib) importAll;
         in
-          with pkgs.lib;
-            {
-              formatter.${system} =
-                if formatter == "alejandra"
-                then pkgs.alejandra
-                else if formatter == "nixpkgs-fmt"
-                then pkgs.nixpkgs-fmt
-                else throw "Unknown formatter: '${formatter}'";
+          {
+            formatter.${system} =
+              if formatter == "alejandra"
+              then pkgs.alejandra
+              else if formatter == "nixpkgs-fmt"
+              then pkgs.nixpkgs-fmt
+              else throw "Unknown formatter: '${formatter}'";
 
-              packages.${system} = pkgs.local;
+            packages.${system} = pkgs.${prefix};
 
-              overlays.default = final: prev: let
-                overlay =
-                  if localOverlayPath != null
-                  then import localOverlayPath
-                  else (final: prev: {});
-              in
-                mapOverlayOverride "local" overlay final prev
-                // optionalAttrs (unstable != null) {
-                  unstable = importPkgs unstable;
+            overlays.default = final: prev: let
+              overlay =
+                if paths ? localOverlay
+                then import localOverlayPath
+                else (final: prev: {});
+            in
+              mapOverlayOverride prefix overlay final prev
+              // optionalAttrs (unstable != null) {
+                unstable = importPkgs unstable;
+              };
+          }
+          // optionalAttrs (paths ? nixosSource) {
+            nixosConfigurations = let
+              nixosSystem = {modules}:
+                lib.makeOverridable nixpkgs.lib.nixosSystem {
+                  inherit modules pkgs system;
+
+                  specialArgs = {
+                    inherit flakes;
+
+                    doctrine = mkDoctrine {
+                      inherit pkgs;
+                      namespace = "sys";
+                    };
+                  };
                 };
-            }
-            // optionalAttrs (nixosSourcePath != null) {
-              nixosConfigurations = let
-                nixosSystem = {modules}:
-                  makeOverridable nixpkgs.lib.nixosSystem {
-                    inherit modules pkgs system;
 
-                    specialArgs = {
-                      inherit flakes;
+              hostConfig = platform:
+                nixosSystem {
+                  modules = [
+                    self.nixosModules.default
+                    nixosSourcePath
+                    platform
+                  ];
+                };
+            in
+              lib.mapAttrs (_: hostConfig) (importAll {root = nixosPlatformsPath;});
+          }
+          // optionalAttrs (paths ? hmSource) {
+            homeConfigurations = let
+              home = name: platform:
+                home-manager.lib.homeManagerConfiguration {
+                  inherit pkgs;
+
+                  extraSpecialArgs = {
+                    inherit flakes;
+
+                    doctrine = mkDoctrine {
+                      inherit pkgs;
+                      namespace = "hm";
                     };
                   };
 
-                hostConfig = platform:
-                  nixosSystem {
-                    modules = [
-                      self.nixosModules.default
-                      nixosSourcePath
-                      platform
-                    ];
-                  };
-              in
-                mapAttrs (_: hostConfig) (importAll {root = nixosPlatformsPath;});
-            }
-            // optionalAttrs (hmSourcePath != null) {
-              homeConfigurations = let
-                registry = {...}: {
-                  config.nix.registry =
-                    mapAttrs
-                    (_: value: {flake = value;})
-                    flakes;
+                  modules = [
+                    self.homeManagerModules.default
+                    hmSourcePath
+                    platform
+                  ];
                 };
-
-                home = name: platform:
-                  home-manager.lib.homeManagerConfiguration {
-                    inherit pkgs;
-
-                    extraSpecialArgs = {
-                      inherit flakes;
-                    };
-
-                    modules = [
-                      self.homeManagerModules.default
-                      hmSourcePath
-                      platform
-                      registry
-                    ];
-                  };
-              in
-                mapAttrs home (importAll {root = hmPlatformsPath;});
-            };
+            in
+              lib.mapAttrs home (importAll {root = hmPlatformsPath;});
+          };
       };
     };
 }