fix broken zig package

nix/zig.nix

@@ -0,0 +1,41 @@
+{ pkgs }:
+
+let
+  version = "0.8.0";
+
+  osName = if pkgs.stdenv.isDarwin then "macos" else "linux";
+
+  splitSystem = builtins.split "-" builtins.currentSystem;
+  arch = builtins.elemAt splitSystem 0;
+  isAarch64 = arch == "aarch64";
+
+  archiveName = "zig-${osName}-${arch}-${version}";
+
+  # If your system is not aarch64, we assume it's x86_64
+  sha256 = if pkgs.stdenv.isDarwin then
+    if isAarch64 then
+      "b32d13f66d0e1ff740b3326d66a469ee6baddbd7211fa111c066d3bd57683111"
+    else
+      "279f9360b5cb23103f0395dc4d3d0d30626e699b1b4be55e98fd985b62bc6fbe"
+  else if isAarch64 then
+    "ee204ca2c2037952cf3f8b10c609373a08a291efa4af7b3c73be0f2b27720470"
+  else
+    "502625d3da3ae595c5f44a809a87714320b7a40e6dff4a895b5fa7df3391d01e";
+in pkgs.stdenv.mkDerivation {
+  pname = "zig";
+  version = version;
+  src = pkgs.fetchurl {
+    inherit sha256;
+    name = "${archiveName}.tar.xz";
+    url = "https://ziglang.org/download/${version}/${archiveName}.tar.xz";
+  };
+  phases = [ "unpackPhase" ];
+  unpackPhase = ''
+    mkdir -p $out/bin
+    tar -xf $src
+    cp ${archiveName}/zig $out/zig
+    cp -r ${archiveName}/lib $out/lib
+    ln -s "$out/zig" "$out/bin/zig"
+    chmod +x $out/bin/zig
+  '';
+}

shell.nix

@@ -32,6 +32,7 @@ let
 
   llvmPkgs = pkgs.llvmPackages_12;
 
+  zig = import ./nix/zig.nix { inherit pkgs; };
   debugir = import ./nix/debugir.nix { inherit pkgs; };
 
   inputs = with pkgs; [