How to set up a connection between two PCs on Mac OS with gray ip?

Question

SSH

There are two PCs running Mac OS El Capitan, both have Internet access, both do not have white ip.
It is required to get from one PC via ssh to another.
I tried to make an IPv6 tunnel through the Freenet6 broker, but when I try to install the client, I get an error that I can't beat
....
bufaux.c:54:10: fatal error: 'openssl/bn.h' file not found
... Are
there any other solutions for this problem? Or can someone tell me how to overcome this error?

Answer 1

Are there any other solutions for this problem?

VNC: TeamViewer
Mikogo

Answer 2

Raise a virtualka like Digital Ocean and forward SSH ports through it.