Enable macOS and ifdLevel 0

Author: hamishmack

flake.nix

@@ -90,7 +90,7 @@
     let
       callFlake = import flake-compat;
 
-      ifdLevel = 3;
+      ifdLevel = 0;
       compiler = "ghc928";
       config = import ./config.nix;
 
@@ -108,9 +108,9 @@
       # systems supported by haskell.nix
       systems = [
         "x86_64-linux"
-        # "x86_64-darwin"
+        "x86_64-darwin"
         "aarch64-linux"
-        # "aarch64-darwin"
+        "aarch64-darwin"
       ];
 
       nixpkgsArgs = {