fix tar command

flake.nix

···
           inherit system overlays;
         };
         rustVersion = pkgs.rust-bin.stable.latest.default;
-        craneLib = (crane.lib.${system}.overrideToolchain rustVersion).overrideScope (import ./overlays/cfg-if-fix.nix);
+        craneLib = ((crane.mkLib pkgs).overrideToolchain rustVersion).overrideScope (import ./overlays/cfg-if-fix.nix);
 
         nurPackages = import ./default.nix {
           inherit pkgs craneLib;
···
         };
       }
     );
-}
+}

overlays/cfg-if-fix.nix

···
 final: prev: {
   buildPackage = args:
     let
-      pname = args.pname or "";
+      pname = args.pname or "unknown";
+      version = args.version or "unknown";
     in
-    prev.buildPackage (args // (
-      if pname == "cfg-if" && args.version == "1.0.0" then {
-        requiredSystemFeatures = [ "local-build" ];
-        unpackPhase = ''
-          tar -xzf $src --no-same-owner
-        '';
-      } else { }
-    ));
-}
+    builtins.trace "Building ${pname}-${version}" (
+      prev.buildPackage (args // (
+        if pname == "cfg-if" then {
+          unpackPhase = ''
+            tar -xzf $src --no-same-owner
+          '';
+        } else { }
+      ))
+    );
+}