On AIX this test was passing even though this error happened on
compiling:
netutil.cc: In function 'int my_pcap_get_selectable_fd(pcap_t*)':
netutil.cc:870:34: error: 'pcap_get_selectable_fd' was not declared in this scope
BPF_TIMEVAL BIOCSRTIMEOUT bug that affects OS X 10.6. If the size of the
parameter to the BIOCSRTIMEOUT ioctl is sizeof(struct timeval) we assume the
workaround is not needed (most platforms). If they are unequal, we assume that
version 1.1.0 or later has a workaround.