Thanks for the prompt response. I'll give that a run and edit this when I get a result and let you know. I thought my error was with git somehow - I'm not as familiar with that as I could be. I understand then if I use git pull while in the /home/mangos/sources/dep directory it will pull just that directory from the repository? or is that the git checkout master?
Edit 7/31/2020:
Okay, so I started completely over - New VM with the same schematics. For the first attempt at the build, I did nothing to the /sources/dep folder and had the expected ACE dependency errors as mentioned in the note. Thereafter I went to the /sources/dep directory and tried "git pull". Git responded with "You aren't currently on a branch", so I used "git checkout master" and then "git pull" all while in the /sources/dep directory. git responded with Already up to date.
Following these, the build got further than the last time, and got to the same point as I had with the first post here - the ACE_DEFAULT_LOG_FLAGS error as described above. Again, many thanks for your assistance in this matter, and I look forward to any further suggestions