Hi Ralph,
unfortunately this breaks building on a glibc system for me:
-- 8< --
$ make
[ 7%] Building C object CMakeFiles/firewall3.dir/iptables.c.o
In file included from /usr/include/linux/netfilter_ipv4.h:8:0,
from /usr/include/linux/netfilter_ipv4/ip_tables.h:21,
The conflict between Musls net/if.h and linux/if.h is an old well known
one and taken care of by a series of linux-headers patches in OpenWrt.
Since Linux 4.8-rc5 Firewall3 also indirectly pulls in linux/in.h and
linux/in6.h leading to new conflicts.
As Firewall3 is fine with just the libc headers
