Hi, I compiled libpcap for mipsel platform. Now I have the proper libpcap.a file. I had to bring the ifaddrs.h file from /usr/bin/ folder. When I compile a simple program (ldev.c) available at: http://www.cet.nau.edu/~mc8/Socket/Tutorials/section1.html Output of the program: [pratik@Akshar libpcap_samples]$ mipsel-uclibc-gcc ldev.c -lpcap /opt/brcm/hndtools-mipsel-uclibc-0.9.19/lib/libpcap.a(fad-getad.o): In function `pcap_findalldevs': fad-getad.c(.text+0xa4): undefined reference to `getifaddrs' fad-getad.c(.text+0x2e0): undefined reference to `freeifaddrs' /opt/brcm/hndtools-mipsel-uclibc-0.9.19/lib/libpcap.a(nametoaddr.o): In function `pcap_ether_hostton': nametoaddr.c(.text+0x764): undefined reference to `ether_hostton' collect2: ld returned 1 exit status [pratik@Akshar libpcap_samples]$ Are ther any patches for the ifaddrs.h file? Cheers, Pratik