just found that x11vnc.tcz is broken on 11.x/x86_64, as it had dependency to openssl as below - can we have recompiled package ?
tc@tc-008064ebe4a1:~$ ldd /usr/local/bin/x11vnc | grep libssl
libssl.so.1.0.0 => not found
libssl.so.1.1 => /usr/local/lib/libssl.so.1.1 (0x00007f047749a000)
tc@tc-008064ebe4a1:~$
[EDIT]: Added code tags. Rich