{stdenv, fetchurl, flex, bison}: stdenv.mkDerivation { name = "libpcap-0.9.8"; src = fetchurl { url = [ http://www.tcpdump.org/release/libpcap-0.9.8.tar.gz http://www.sfr-fresh.com/unix/misc/libpcap-0.9.8.tar.gz ]; sha256 = "1yb2hg8jd1bzq3lbrff1sps4757krvj2c9pm2ixn44a4vsc865f4"; }; buildInputs = [flex bison]; configureFlags = " ${if stdenv.system == "i686-linux" then "--with-pcap=linux" else ""} "; }