Add elftools

pkgs/uboot-quartz64/default.nix

@@ -32,6 +32,22 @@ let
       sha256 = "icoeVb9WGDRcQEzym9yd57sWX8PGYx2ufN3Dj3IT/2c=";
     };
 
+    nativeBuildInputs = [
+      ncurses # tools/kwboot
+      bc
+      bison
+      dtc
+      flex
+      openssl
+      (buildPackages.python3.withPackages (p: [
+        p.libfdt
+        p.setuptools # for pkg_resources
+        p.elftools
+      ]))
+      swig
+      which # for scripts/dtc-version.sh
+    ];
+
     extraMakeFlags = [
       "ARCH=arm"
     ];