Trouble building WireGuard since December releases

[Kevin <anaknaga@inventati.org>]

Hi all,

I've been having trouble building WireGuard on Solus since its December
snapshots. Earlier snapshots (e.g. November) still build without a
problem, even on new kernels. Does this have to do with Solus kernel
builds, or am I overlooking something?

user@t450s-solus ~/bin/WireGuard-0.0.20180118/src $ make debug
test -e include/generated/autoconf.h -a -e include/config/auto.conf ||
(	\
echo >&2;							\
echo >&2 "  ERROR: Kernel configuration is invalid.";		\
echo >&2 "         include/generated/autoconf.h or
include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src
to fix it.";	\
echo >&2 ;							\
/bin/false)
mkdir -p /home/user/bin/WireGuard-0.0.20180118/src/.tmp_versions ; rm
-f /home/user/bin/WireGuard-0.0.20180118/src/.tmp_versions/*
make -f ./scripts/Makefile.build obj=/home/user/bin/WireGuard-
0.0.20180118/src
make[2]: *** No rule to make target '/home/user/bin/WireGuard-
0.0.20180118/src/main.o', needed by '/home/user/bin/WireGuard-
0.0.20180118/src/wireguard.o'.  Stop.
make[1]: *** [Makefile:1507: _module_/home/user/bin/WireGuard-
0.0.20180118/src] Error 2
make: *** [Makefile:39: module-debug] Error 2