Added a Nix flake containing everything needed to build, dev and run …

.envrc

@@ -0,0 +1 @@
+use flake

README.md

@@ -48,8 +48,31 @@ Official binaries for the Redot editor and the export templates will be found
 
 ### Compiling from source
 
-[For the time being, see the official Godot docs](https://docs.godotengine.org/en/latest/contributing/development/compiling)
-for compilation instructions for every supported platform.
+#### Using Nix (recommended)
+
+If you have the Nix package manager installed, you can build and run the editor in one command:
+
+```bash
+nix run .
+```
+
+This will automatically install all build dependencies and compile Redot if the binary doesn't exist.
+
+For manual control over the build process:
+
+```bash
+# Enter the Nix development environment
+nix develop
+
+# Build Redot
+scons platform=linuxbsd
+
+# Run the editor
+./bin/redot.linuxbsd.editor.x86_64
+```
+
+Nix works on Linux and macOS, and is available at [nixos.org/download.html](https://nixos.org/download.html).
+
 
 ## Community and contributing
 

flake.nix

@@ -0,0 +1,108 @@
+{
+  description = "A Nix-flake-based C/C++ development environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+    forEachSupportedSystem = f:
+      nixpkgs.lib.genAttrs supportedSystems (system:
+        f rec {
+          pkgs = import nixpkgs {inherit system;};
+          isDarwin = pkgs.lib.hasSuffix system "darwin";
+
+          linuxDeps = with pkgs; [
+            autoPatchelfHook
+            xorg.libX11
+            xorg.libXcursor
+            xorg.libXinerama
+            xorg.libXext
+            xorg.libXrandr
+            xorg.libXrender
+            xorg.libXi
+            xorg.libXfixes
+            libxkbcommon
+            wayland-scanner
+            wayland
+            libdecor
+            alsa-lib
+            libpulseaudio
+            udev
+            dbus
+            dbus.lib
+          ];
+
+          darwinDeps = with pkgs; [
+            Foundation
+            Cocoa
+            AudioToolbox
+            CoreAudio
+            CoreVideo
+            AVFoundation
+          ];
+
+          commonDeps = with pkgs; [
+            pkg-config
+            installShellFiles
+            python3
+            speechd
+            makeWrapper
+            mono
+            dotnet-sdk_8
+            dotnet-runtime_8
+            vulkan-loader
+            libGL
+            fontconfig
+            fontconfig.lib
+            scons
+          ];
+
+          deps = if isDarwin then darwinDeps ++ commonDeps else linuxDeps ++ commonDeps;
+          libraryPathVar = if isDarwin then "DYLD_LIBRARY_PATH" else "LD_LIBRARY_PATH";
+          platform = if isDarwin then "macos" else "linuxbsd";
+          binary = if isDarwin then "redot.macos.editor.x86_64" else "redot.linuxbsd.editor.x86_64";
+        });
+  in {
+    apps = forEachSupportedSystem ({
+      pkgs,
+      deps,
+      libraryPathVar,
+      platform,
+      binary,
+    }: let
+      script = pkgs.writeShellScript "redot" ''
+        export ${libraryPathVar}=${pkgs.lib.makeLibraryPath deps}
+        if [ ! -f ./bin/${binary} ]; then
+          echo "Building Redot..."
+          scons platform=${platform}
+        fi
+        exec ./bin/${binary} "$@"
+      '';
+    in {
+      default = {
+        type = "app";
+        program = "${script}";
+      };
+    });
+
+    devShells = forEachSupportedSystem ({
+      pkgs,
+      deps,
+      libraryPathVar,
+    }: {
+      default =
+        pkgs.mkShell.override
+        {
+          # Override stdenv in order to change compiler:
+          # stdenv = pkgs.clangStdenv;
+        }
+        {
+          packages = deps;
+          ${libraryPathVar} = pkgs.lib.makeLibraryPath deps;
+        };
+    });
+  };
+}