call the executable inkscape. whatever

flake.nix

@@ -1,10 +1,11 @@
 { outputs = { self, nixpkgs }:
   let
     system = "x86_64-linux";
-    i-w = nixpkgs.legacyPackages.${system}.callPackage ./inkscape-x11.nix { };
+    pkgs   = nixpkgs.legacyPackages.${system};
+    i-w    = pkgs.callPackage ./inkscape-xwayland.nix { };
   in {
     packages.${system}.inkscape-xwayland = i-w;
-    apps.${system}.default =
-      { type = "app"; program = "${i-w}/bin/inkscape-xwayland"; };
+    apps.${system}.default = { type = "app"; program = "${i-w}/bin/inkscape"; };
+    overlays.default = final: prev: { inkscape-xwayland = i-w; };
   };
 }

inkscape-xwayland.nix

@@ -14,6 +14,6 @@ stdenv.mkDerivation rec {
   dontUnpack = true; dontFixup = true;
   installPhase = ''
     mkdir -p $out/bin
-    cp ${script} $out/bin/inkscape-xwayland
+    cp ${script} $out/bin/inkscape
   '';
 }