ShrewSoft VPN Install - Issues with CMAKE

Has anyone successfully installed ShrewSoft VPN on Pureos? I have a need to install it so that I can connect to a Watchguard firewall for a work environment.

I have been stuck on getting the cmake utility installed on Pureos and I’m wondering if anyone else uses cmake and could help me get it installed. I come from a Windows/Apple background and am learning Linux - Debian now so I’m still a bit green.