Added basic flake support for x86_64-linux.

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1743315132,
+        "narHash": "sha256-6hl6L/tRnwubHcA4pfUUtk542wn2Om+D4UnDhlDW9BE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "52faf482a3889b7619003c0daec593a1912fddc1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "A flake that provides the proxytunnel command";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  }: let
+    # TODO: Check functionality and add support for other architectures.
+    pkgs = nixpkgs.legacyPackages."x86_64-linux";
+  in {
+    packages.x86_64-linux.default = pkgs.stdenv.mkDerivation {
+      pname = "proxytunnel";
+
+      version = "1.0.0";
+
+      src = ./.;
+      nativeBuildInputs = [pkgs.gnumake];
+      buildInputs = [pkgs.openssl];
+
+      buildPhase = ''
+        make
+      '';
+
+      installPhase = ''
+        mkdir -p $out/bin
+        cp ./proxytunnel $out/bin
+      '';
+    };
+
+    devShells.x86_64-linux.default = pkgs.mkShell {
+      packages = [self.packages.x86_64-linux.default];
+    };
+  };
+}