I bought Synergy from Symless to use on my Windows 10 laptop, and my Raspberry Pi.
For the Raspberry Pi, I have tried many tutorials on how to build it from the source code and such.
The best and most current as of now, that I have been able to find, is this wiki (Install Synergy Raspberry Pi 3 - January 2017): http://www.etcwiki.org/wiki/Install_Synergy_Raspberry_Pi_3_-_January_2017
However, I made A LOT of stupid mistakes and ran into issues, that looking back, I should of figured out earlier.
These are just problems I came across, how I diagnosed them, and how I fixed the