This is working for the simple example on MacOS

Author: sstitle

shell.nix

@@ -0,0 +1,45 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+let
+  zigVersion = builtins.replaceStrings ["\n"] [""] (builtins.readFile ./.zigversion);
+
+  # Determine platform-specific details
+  platform = if pkgs.stdenv.isDarwin then "macos" else "linux";
+  arch = if pkgs.stdenv.isAarch64 then "aarch64" else "x86_64";
+
+  # URL for the Zig binary
+  zigUrl = "https://pkg.machengine.org/zig/zig-${platform}-${arch}-${zigVersion}.tar.xz";
+
+  zigSrc = pkgs.fetchurl {
+    url = zigUrl;
+    hash = "sha256-/vTDPMiyya8cr0ffmHhsa8BJ3XDsbAXHlKMnOyk3gBs=";
+  };
+
+  zigVersionCompatibleWithMach = pkgs.stdenv.mkDerivation {
+    pname = "zig";
+    version = zigVersion;
+
+    src = zigSrc;
+
+    dontBuild = true;
+    dontConfigure = true;
+
+    installPhase = ''
+        mkdir -p $out/bin
+        cp -r ./* $out/
+        chmod +x $out/zig
+        ln -s $out/zig $out/bin/zig
+    '';
+  };
+
+in pkgs.mkShell {
+  buildInputs = [
+    pkgs.git
+    zigVersionCompatibleWithMach
+  ];
+
+  shellHook = ''
+    echo "Zig ${zigVersion} loaded"
+    zig version
+  '';
+}