diff --git a/ops/nixos/porcorosso/default.nix b/ops/nixos/porcorosso/default.nix
index 1729c73042..fcea5990a7 100644
--- a/ops/nixos/porcorosso/default.nix
+++ b/ops/nixos/porcorosso/default.nix
@@ -50,7 +50,7 @@ in lib.fix (self: {
 
   nixpkgs.config = { allowUnfree = true; };
 
-  nix.nixPath = [ "depot=/home/lukegb/depot/" ];
+  nix.nixPath = [ "depot=/home/lukegb/depot/" "nixpkgs=/home/lukegb/depot/third_party/nixpkgs/" ];
 
   # Use the systemd-boot EFI boot loader.
   boot.loader.systemd-boot.enable = true;
@@ -108,7 +108,9 @@ in lib.fix (self: {
     (steam.override { extraProfile = nvidia-offload-profile; })
     rebuilder
     blackbox
-    mercurial
+    (mercurial.overridePythonAttrs (origAttrs: {
+      propagatedBuildInputs = origAttrs.propagatedBuildInputs ++ [python3Packages.hg-evolve];
+    }))
     arcanist
     age
   ];