python3Packages.foxdot: enable darwin build

by not requiring SuperCollider.

User can install the official binary of SuperCollider and use that.

pkgs/development/python-modules/foxdot/default.nix

@@ -1,4 +1,10 @@
-{ lib, buildPythonPackage, fetchPypi, tkinter, supercollider }:
+{ lib
+, stdenv
+, buildPythonPackage
+, fetchPypi
+, tkinter
+, supercollider
+}:
 
 buildPythonPackage rec {
   pname = "FoxDot";
@@ -9,7 +15,10 @@ buildPythonPackage rec {
     sha256 = "528999da55ad630e540a39c0eaeacd19c58c36f49d65d24ea9704d0781e18c90";
   };
 
-  propagatedBuildInputs = [ tkinter supercollider ];
+  propagatedBuildInputs = [ tkinter ]
+    # we currently build SuperCollider only on Linux
+    # but FoxDot is totally usable on macOS with the official SuperCollider binary
+    ++ lib.optionals stdenv.isLinux [ supercollider ];
 
   # Requires a running SuperCollider instance
   doCheck = false;