add basic Nix flake

CMakeLists.txt

@@ -112,3 +112,5 @@ if(UNIX AND NOT APPLE)
 elseif(WIN32)
     target_link_libraries(${PROJECT_NAME} winmm)
 endif()
+
+install(TARGETS supertuxkart-editor)

flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "stk-editor flake";
+
+  inputs = {
+    nixpkgs.url = github:nixos/nixpkgs?ref=nixos-24.05;
+  };
+
+  outputs =
+    { nixpkgs
+    , self
+    } @ inputs:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+    {
+      packages.${system}.default = pkgs.stdenv.mkDerivation {
+        pname = "supertuxkart-editor";
+        version = "git";
+        src = ./.;
+        nativeBuildInputs = with pkgs; [
+          cmake
+          glew
+          makeWrapper
+          physfs
+          xorg.libX11
+          xorg.libXxf86vm
+          zlib
+        ];
+        postInstall = ''
+          cp -r $src/src/font -t $out/bin
+        '';
+        preFixup = ''
+          wrapProgram $out/bin/supertuxkart-editor --run "cd $out/bin"
+        '';
+      };
+    };
+}