Remember to pull it with --recursive to pick up the submodules. Example:
git clone --recursive https://github.com/SpringCabal/Hunted.git Hunted.sdd
Make sure you have git configured to automatically fetch submodules:
git config --global fetch.recurseSubmodules true
Use engine from: https://springrts.com/dl/buildbot/default/ld33_prep/100.0.1-1-gffd50a7/