novoalign: Failed to import: novoalign: Uninitialized constant Novoalign::MACOS

After tapping homebrew/science `brew doctor` complains about novoalign:

    brew tap home-brew/science
    brew doctor -d
    /usr/local/Library/brew.rb: loading /usr/local/Library/Formula/novoalign.rb
    Error: Failed to import: novoalign
    uninitialized constant Novoalign::MACOS

I changed the references from `MACOS` to `OS.mac?`. Couldn't find any other formula that uses `OS.mac?` but `MacOS` doesn't to be the right one to check the platform