problem building busybox on x86_64

[Richard B. Pyne]

In file included from /usr/include/linux/sysctl.h:25:0,
                  from /usr/include/linux/netfilter.h:6,
                  from /usr/include/linux/netfilter_ipv4.h:8,
                  from networking/tcpudp.c:37:
/usr/include/linux/kernel.h:12:8: error: redefinition of 'struct sysinfo'
include/libbb.h:105:8: note: originally defined here
make[1]: *** [networking/tcpudp.o] Error 1
make: *** [networking] Error 2