I too had make-pango-font-tree peppered here and there. I adapted the code manually as convert-ly actually does not work at all on my system for the time being which is quite strange.
>> What is the new and correct command? > You can find that in changes.tely. git log -p $ly/Documentation/en/changes.tely ^ is what I do to find such information. -- Pierre-Luc Gauthier