Got it going on Windows and Ubuntu Mate, supercool.
Now trying to compile version 1.7.4 on Raspbian.
yuk, so many dependencies, people have been here before thanks goodness.
https://www.rootusers.com/compiling-synergy-from-source-on-the-raspberry-pi/I think making .tcz's has got to be simple compared to C compiling src code.
Rats, got up to 80% build before saying something about SecureSocket.
Lots of X11 stuff so probably only suitable for the X11 piCore version.
Think I will stick with Filezilla/Superputty and sshing for my piCore coding.