Hi, I need a quick ruby primer, please. I'd like to install this, https://github.com/pedrozath/coltrane
> sudo gem install coltrane won't work because I'm on Mojave with an an ancient ruby and this requires ruby 2.7 or above. > sudo port -vsN install ruby installs ruby18 by default > sudo port -vsN install ruby27 > sudo port select --set ruby ruby27 installs, but gem still complains. just guessing at this point: > port -vsN install rb-rubygems reinstalls ruby18 >< Help, please.
