Enable kokkos on macOS

Author: bkpoon

simtbx/SConscript

@@ -34,6 +34,7 @@ if not env_etc.no_boost_python:
   env_simtbx.SConscript("gpu/SConscript",exports={ 'env' : env_simtbx })
   env_simtbx.SConscript("pixel/SConscript",exports={ 'env' : env_simtbx })
 
-  # only build kokkos on linux and if kokkos is enabled
-  if sys.platform.startswith('linux') and env_etc.enable_kokkos:
+  # only build kokkos on linux/macOS and if kokkos is enabled
+  if (sys.platform.startswith('linux') or sys.platform == 'darwin') \
+    and env_etc.enable_kokkos:
     env_simtbx.SConscript("kokkos/SConscript",exports={ 'env' : env_simtbx })