The preferred way to use Terrasync has for several years been the one
built into the main fgfs binary (enabled with File > Scenery Download),
not the separate binary.
If this doesn't work (and especially if ~/.fgfs/fgfs.log contains ERROR:
no http-server found, terrasync will be disabled), it's probably their
recent DNS issues (
https://sourceforge.net/p/flightgear/mailman/message/35707927/ ), not
this bug.
(I'm not sure why the separate Terrasync isn't built, as it still looks
to exist and be on-by-default in CMakeLists.txt, but you probably don't
want to use it.)
