Hello,
           I have a question regarding the pfil hook functions. The below link has some example code to add and remove a
 pfil hook along with entry function. 

http://www.qnx.com/developers/docs/6.4.1/io-pkt_en/user_guide/filtering.html#Packet_Filters

This code when compiled gives me errors for all the pfil calls, like 
pfil_head_get(), pfil_add_hook(), pfil_remove_hook() etc. Do I have to include any library. I am building this on QNX6.4
.0. I have all the header files needed for io-pkt.

I get an error saying the above pfil calls "was not declared in this scope". 

Can you please let me know if I have to include any libs for pfil functions

Thanks
Vinod