diff --git a/package.nix b/package.nix
index 8725d02..e5c4f98 100644
--- a/package.nix
+++ b/package.nix
@@ -28,24 +28,15 @@ in {
 
   outputs = [ "out" "modules" ];
 
+  # These are propagated to sub-derivations.
   doCheck = true;
   doInstallCheck = true;
 
-  phases = [ "unpackPhase" "patchPhase" "installPhase" ];
-
-  src = linkFarm "dynix-source" {
-    inherit (self) dynixCommand dynixModules;
-  };
-
-  installPhase = ''
-    runHook preInstall
-
+  buildCommand = ''
     mkdir -p "$out"
     cp -r --reflink=auto "$dynixCommand/"* "$out/"
     mkdir -p "$modules"
     cp -r --reflink=auto "$dynixModules/"* "$modules/"
-
-    runHook postInstall
   '';
 
   #