nix-build for penrose works now!

penrose/default.nix

@@ -1,23 +1,34 @@
+{ pkgs ? import <nixpkgs> { } }:
+
 let
-  nixpkgs = import <nixpkgs> { };
-in
-with nixpkgs;
-stdenv.mkDerivation {
-  meta = with pkgs.lib; {
-    description = "window manager";
+  generatedBuild = import ./Cargo.nix {
+    inherit pkgs;
+    defaultCrateOverrides = with pkgs; defaultCrateOverrides // {
+      cairo-sys-rs = attrs: {
+        buildInputs = [ pkg-config cairo ];
+      };
+      gobject-sys = attrs: {
+        buildInputs = [
+          pkg-config
+          glib.dev
+        ];
+      };
+      pango-sys = attrs: {
+        buildInputs = [
+          pkg-config
+	  pango
+        ];
+      };
+ pangocairo-sys = attrs: {
+        buildInputs = [
+          pkg-config
+	  gnome2.pango.dev
+        ];
+      };
+
+
+    };
   };
-  pname = "penrose";
-  name = "desktop-env";
-  buildInputs = [
-    cargo
-    rustc
-    pkgconfig
-    glib.dev
-    nix
-    cairo
-    pango
-    gcc
-    python311
-    pkg-config
-  ];
-}
+in
+generatedBuild.rootCrate.build
+

penrose/result

@@ -0,0 +1 @@
+/nix/store/q9ziy7c3vkxhiz5d7q3ac27ssbiaxm9k-rust_nixos-0.1.0