Several submodules of midas have been re-organized, so if you want to pull the 
newest version, you need a 

git pull --recurse-submodules
git submodule update --init --recursive

before you can build again. To do this automatically the next time, you can do

git config submodule.recurse true

which needs git 2.14 or later. I hope this works for everybody. If there is a 
better way to do that (I'm not a big expert on git) please reply here.

Stefan