~/WireGuard/src# make
CC [M] /root/WireGuard/src/main.o
CC [M] /root/WireGuard/src/noise.o
CC [M] /root/WireGuard/src/device.o
/root/WireGuard/src/device.c: In function 'wg_xmit':
/root/WireGuard/src/device.c:165:3: error: implicit declaration of function 'skb_mark_not_on_list' [-Werror=implicit-function-declaration]
skb_mark_not_on_list(skb);
^~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
scripts/Makefile.build:326: recipe for target '/root/WireGuard/src/device.o' failed
make[2]: *** [/root/WireGuard/src/device.o] Error 1
Makefile:1535: recipe for target '_module_/root/WireGuard/src' failed
make[1]: *** [_module_/root/WireGuard/src] Error 2
Makefile:37: recipe for target 'module' failed
make: *** [module] Error 2
TIA for any insights. Robert