Cloning Spheral

If you use git to clone the Spheral source be aware Spheral includes git submodules: BLT and Uberenv. In order to ensure such submodules are properly downloaded when cloning Spheral be sure to use the --recursive git option:

git clone --recursive

If you forget to use the --recursive argument or if you checkout from a different branch you must run:

git submodule update --init --recursive