diff --git a/hive.nix b/hive.nix
index b23b83f..0332ca9 100644
--- a/hive.nix
+++ b/hive.nix
@@ -11,17 +11,9 @@ let
 
   sources = import ./sources.nix;
 
-  inherit (sources) bootstrapNixpkgs;
+  lib = sources.fullLib;
 
-  lib = bootstrapNixpkgs.lib.extend (_: _: {
-    extra = import ./lib/nix-lib; 
-  });
-
-  nix-lib = lib.extra; # TODO: Assess perf penalty of fixed point
-  # TODO same but using bootstrapnixpkgs for nix-lib instanciation
-  # original statement: import ./lib/nix-lib;
-
-  inherit (nix-lib) mapSingleFuse;
+  inherit (lib.extra) mapSingleFuse;
 
   ### Let's build meta
   metadata = (import ./meta) lib;
@@ -46,7 +38,6 @@ let
       };
     };
 
-
   # Build up the arguments to instantiate a nixpkgs given a system and a version.
   mkNixpkgsConfig =
     system:
@@ -58,13 +49,12 @@ let
     .${system} or (throw "Unknown system: ${system} for nixpkgs configuration instantiation");
 
   # Instanciates the required nixpkgs version
-  mkSystemNixpkgs = system: version:
-    import sources."nixos-${version}" (mkNixpkgsConfig system version);
+  mkSystemNixpkgs =
+    system: version: import sources."nixos-${version}" (mkNixpkgsConfig system version);
 
   # All supported nixpkgs versions × systems, instanciated
   nixpkgs = mapSingleFuse (s: mapSingleFuse (mkSystemNixpkgs s) nixpkgs'.versions) nixpkgs'.systems;
 
-
   # Get the configured nixos version for the node,
   # defaulting to the one defined in meta/nixpkgs
   version = node: metadata.nodes.${node}.nixpkgs.version;
@@ -74,12 +64,10 @@ let
   nodePkgs = node: nixpkgs.${system node}.${version node};
 
   ##########
-  # Function to create arguments based on the node 
+  # Function to create arguments based on the node
   #
   mkArgs = node: rec {
-    lib = sourcePkgs.lib // {
-      extra = nix-lib;
-    };
+    lib = sourcePkgs.lib.extend sources.libOverlay;
 
     sourcePkgs = nodePkgs node;
     meta = metadata;
diff --git a/keys.nix b/keys.nix
index 7945d52..09779b4 100644
--- a/keys.nix
+++ b/keys.nix
@@ -3,11 +3,11 @@
 # SPDX-License-Identifier: EUPL-1.2
 
 let
-  _sources = import ../npins;
+  sources = import ./sources.nix;
 
-  inherit (import _sources.nixpkgs { }) lib;
+  lib = sources.fullLib;
 
   meta = (import ../meta lib).config;
 
 in
-  import ./lib/keys { inherit meta lib; }
+import ./lib/keys { inherit meta lib; }
diff --git a/lib/keys/default.nix b/lib/keys/default.nix
index 1ecdb23..4d845a8 100644
--- a/lib/keys/default.nix
+++ b/lib/keys/default.nix
@@ -6,7 +6,7 @@
 
 { meta, lib }:
 let
-  inherit (import ../nix-lib) setDefault unique;
+  inherit (lib.extra) setDefault unique;
 
   getAttr = lib.flip builtins.getAttr;
 in
diff --git a/lib/nix-lib/default.nix b/lib/nix-lib/default.nix
index be73b69..94f8c18 100644
--- a/lib/nix-lib/default.nix
+++ b/lib/nix-lib/default.nix
@@ -2,17 +2,13 @@
 # SPDX-FileCopyrightText: 2024 Tom Hubrecht <tom.hubrecht@dgnum.eu>
 #
 # SPDX-License-Identifier: EUPL-1.2
-
-let
-  # Reimplement optional functions
-  _optional =
-    default: b: value:
-    if b then value else default;
-in
+{ lib }:
 
 rec {
-  inherit (import ./nixpkgs.nix)
+  inherit (lib)
     flip
+    optionals
+    optionalString
     hasPrefix
     recursiveUpdate
     splitString
@@ -112,11 +108,8 @@ rec {
 
   subAttrs = attrs: builtins.map (subAttr attrs);
 
-  optionalList = _optional [ ];
+  optionalList = optionals;
 
-  optionalAttrs = _optional { };
-
-  optionalString = _optional "";
   /*
     Same as fuseAttrs but using `lib.recursiveUpdate` to merge attribute
     sets together.
diff --git a/meta/verify.nix b/meta/verify.nix
index be168d8..20205c0 100644
--- a/meta/verify.nix
+++ b/meta/verify.nix
@@ -32,9 +32,7 @@ in
       import ./dns.nix {
         inherit dns;
 
-        lib = pkgs.lib // {
-          extra = import ../lib/nix-lib;
-        };
+        lib = sources.fullLib;
       }
     )
   );
diff --git a/sources.nix b/sources.nix
index 1ea96f7..82bca84 100644
--- a/sources.nix
+++ b/sources.nix
@@ -5,19 +5,34 @@
 # SPDX-License-Identifier: EUPL-1.2
 
 let
-  sources' = import ./npins;
+  rawSources = import ./npins;
 
-  bootstrapNixpkgs = import sources'.nixos-unstable { };
+  bootstrapNixpkgs = import rawSources.nixos-unstable { };
 
   patch = (import ./lib/nix-patches { patchFile = ./patches; }).base {
     pkgs = bootstrapNixpkgs;
   };
 
-  sources = builtins.mapAttrs (
+  patchedSources = builtins.mapAttrs (
     k: src:
     patch.applyPatches {
       inherit src;
       name = k;
     }
-  ) sources';
-in sources // { bootstrapNixpkgs = bootstrapNixpkgs; unpatchedSources = sources; }
+  ) rawSources;
+
+  libOverlay = final: _: {
+    extra = import ./lib/nix-lib { lib = final; };
+  };
+in
+patchedSources
+// {
+
+  inherit
+    bootstrapNixpkgs
+    libOverlay
+    rawSources
+    ;
+
+  fullLib = bootstrapNixpkgs.lib.extend libOverlay;
+}