reubenhwk/radvd — pull request #6 by vapier (2013-03-14 14:21:53+00:00)
Title: fix builds on newer Linux arches

Newer Linux ports are dropping sysctl support. If you try to even
include the header, you'll get build failures:
/usr/include/bits/sysctl.h:19:3: error: #error "sysctl system call is unsupported"

Check for the header before we try to use it.

Signed-off-by: Mike Frysinger