pypcap v1.1.4

in mac osx, if i set immediate=False, can not sniff any packet
if i set immediate=True, my code works right

in linux, if i set immediate=True, it will throws this execption
File "/root/work/pytscan/pytscan/scan.py", line 735, in pypcapParse
pc = pcap.pcap(name=self.iface,immediate=True)
File "pcap.pyx", line 210, in pcap.pcap.init (pcap.c:1773)
OSError: couldn't enable immediate mode

thank you, guys