diff --git a/nix/configuration/hosts/odo/optimized_build.nix b/nix/configuration/hosts/odo/optimized_build.nix
index c83639f..74a0cc3 100644
--- a/nix/configuration/hosts/odo/optimized_build.nix
+++ b/nix/configuration/hosts/odo/optimized_build.nix
@@ -22,16 +22,18 @@
         "nixos-test"
       ];
 
+      # Keep ALL dependencies so we can rebuild offline. This DRASTICALLY increase disk usage, but disk space is cheap.
+      # system.includeBuildDependencies = true;
+
       # nixpkgs.hostPlatform = {
       #   gcc.arch = "znver4";
       #   gcc.tune = "znver4";
       #   system = "x86_64-linux";
-
       # };
 
       nixpkgs.overlays = [
         (
-          self: super:
+          final: prev:
           let
             optimizeWithFlags =
               pkg: flags:
@@ -62,11 +64,17 @@
                   HZ_1000 = lib.kernel.no;
                 }
                 (
-                  optimizeWithFlags super.linux_6_13 [
+                  optimizeWithFlags prev.linux_6_13 [
                     "-march=znver4"
                     "-mtune=znver4"
                   ]
                 );
+            # gsl = prev.gsl.overrideAttrs (old: {
+            #   # gsl tests fails when optimizations are enabled.
+            #   # > FAIL: cholesky_invert unscaled hilbert (  4,  4)[0,2]: 2.55795384873636067e-13                        0
+            #   # >  (2.55795384873636067e-13 observed vs 0 expected) [28259614]
+            #   doCheck = false;
+            # });
           }
         )
       ];