{stdenv, fetchurl, flex, bison}: stdenv.mkDerivation { name = "libpcap-0.9.5"; src = fetchurl { url = http://www.tcpdump.org/release/libpcap-0.9.5.tar.gz; md5 = "b0626ad59004fe5767ddd2ce743a2271"; }; buildInputs = [flex bison]; configureFlags = " ${if stdenv.system == "i686-linux" then "--with-pcap=linux" else ""} "; }