For about 20 years I maintaned a coot package in fink. The standalone coot package was in fact based on fink as well. Homebrew is now miles ahead of fink, both in terms of ease of use, and in terms of running natively on "Apple Silicon/M1x" processors. In addition, fink had fallen far behind with respect to maintaining packages upon which coot relies for its GUI functionality. For that reason, I recommend installing Homebrew (which can peacefully coexist with other package management systems).
brew upgrade brew tap brewsci/bio brew tap brewsci/science brew tap brewsci/num brew tap brewsci/base brew install pymol
brew install wget
wget https://raw.githubusercontent.com/YoshitakaMo/homebrew-bio/coot/Formula/coot.rb -O coot.rbbrew install ./coot.rb --verbose --debug --keep-tmp --HEAD(Eventually that will be available within Homebrew, and it will just download and install a pre-compiled binary.)