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

.envrc

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+use flake

flake.nix

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+{
+  description = "A Nix-flake-based C/C++ development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  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;};
+          deps = with pkgs; [
+            pkg-config
+            autoPatchelfHook
+            installShellFiles
+            python3
+            speechd
+            wayland-scanner
+            makeWrapper
+            mono
+            dotnet-sdk_8
+            dotnet-runtime_8
+            vulkan-loader
+            libGL
+            xorg.libX11
+            xorg.libXcursor
+            xorg.libXinerama
+            xorg.libXext
+            xorg.libXrandr
+            xorg.libXrender
+            xorg.libXi
+            xorg.libXfixes
+            libxkbcommon
+            alsa-lib
+            mono
+            wayland-scanner
+            wayland
+            libdecor
+            libpulseaudio
+            dbus
+            dbus.lib
+            speechd
+            fontconfig
+            fontconfig.lib
+            udev
+            dotnet-sdk_8
+            dotnet-runtime_8
+            scons
+          ];
+        });
+  in {
+    devShells = forEachSupportedSystem ({
+      pkgs,
+      deps,
+    }: {
+      default =
+        pkgs.mkShell.override
+        {
+          # Override stdenv in order to change compiler:
+          # stdenv = pkgs.clangStdenv;
+        }
+        {
+          packages = deps;
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath deps;
+        };
+    });
+  };
+}