pythonPackages.pygmt: Mark as broken on darwin

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

@@ -1,4 +1,4 @@
-{ lib
+{ stdenv
 , pythonOlder
 , buildPythonPackage
 , fetchFromGitHub
@@ -36,10 +36,12 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "pygmt" ];
 
-  meta = with lib; {
+  meta = with stdenv.lib; {
     description = "A Python interface for the Generic Mapping Tools";
     homepage = "https://github.com/GenericMappingTools/pygmt";
     license = licenses.bsd3;
+    # pygmt.exceptions.GMTCLibNotFoundError: Error loading the GMT shared library '/nix/store/r3xnnqgl89vrnq0kzxx0bmjwzks45mz8-gmt-6.1.1/lib/libgmt.dylib'
+    broken = stdenv.isDarwin;
     maintainers = with maintainers; [ sikmir ];
   };
 }