Glenn, it sounds like you accidentally added a question mark to the end
of your git clone command. If so, you can fix this by typing the
following in the directory where you ran that command:
mv '?' RHVoice
Note the single quotes around the question mark.
Yes, building from source is sometimes a hassle. Fortunately, RHVoice is
already packaged in Debian testing, so Armbian will get it sooner or
later. I suppose someone could backport the packages and set up their
own APT repo if they wanted to.
Hope this helps,
Matt