I updated to Synergy 1.8.4 (Basic) today and the server doesn't start any longer. I'm running Debian Stretch 64Bit. Interestingly the error is related to SSL and crypto libraries, which I thought the basic version didn't use.
[2016-10-13T20:44:39] INFO: log level: INFO
/usr/bin/synergys: error while loading shared libraries: libssl.so.1.0.0: cannot open shared object file: No such file or directory
[2016-10-13T20:44:39] ERROR: process exited with error code: 127