anchor.diff: -{ stdenv, fetchurl, libevent }:
  +{ stdenv, fetchurl, libevent, libtirpc }:
   
   stdenv.mkDerivation rec {
     name = "trickle-1.07";
  
positive.code:     sed -i '/#define in_addr_t/ s:^://:' config.h
    '';
  
    LDFLAGS = "-levent";
  
    configureFlags = [ "--with-libevent" ];
  
  
negative.code:     sha256 = "0s1qq3k5mpcs9i7ng0l9fvr1f75abpbzfi1jaf3zpzbs1dz50dlx";
    };
  
    buildInputs = [ libevent libtirpc ];
  
    preConfigure = ''
      sed -i 's|libevent.a|libevent.so|' configure
  