Hi Eva,
Sorry you’re having trouble with this, but to be fair, ANTs is a separate project, and this isn’t the best forum to get help… You can get help direct from the right people by asking on their forum.
However, I can probably offer a couple of pointers here. The first one is that you’re using the anaconda compiler. Our users have always had issues building MRtrix when anaconda is installed, and we’ve gone to great lengths to avoid any interference from it. I wouldn’t be surprised if that didn’t also happen with other applications.
The second point is that if you’ve got anaconda installed already, why not install the pre-compiled version of ANTs that anaconda provides? It should be a simple matter of typing:
conda install -c aramislab ants