>> if you have installed firmware remove it if possible.
> The install Process check that /usr/include/machine is empty.
>> then check that the directory /usr/include/machine is empty.
> If not clean it.
> I think this part is way off and probably all the way into "bad advice".
>
> Cleaning /usr/include/machine is wrong, and fw_update seems completely
> unrelated to either the contents of the C includes or building WG.
but without cleaning /usr/include/machine the install Process fails ...
...
golang.zx2c4.com/wireguard/tun
golang.zx2c4.com/wireguard/device
install -d "/usr/local/bin" && install -m 0755 "wireguard-go" "/usr/local/bin/wireguard-go"
gmake: Leaving directory '/usr/src/wireguard/wireguard-go-0.0.20190908'
[+] Cleaning up build directory
comptest# ls /usr/include/machine/
_float.h exec.h limits.h rbus_machdep.h