Installing and 'quick starting' on CentOS 7

[Jason A. Donenfeld]

CentOS 7 doesn't actually use a real 3.10 kernel. They've backported
tons of things. I almost got it to compile by fooling the compat
codebase into thinking I was "3.18.100", which sort of worked, until
it got to the udp_tunnel maze. If you want to work through it and come
up with a patch, maybe you can convince the maintainer of the centos
package for wireguard to ship that patch. You're probably best off,
though, using a non weird kernel.