anchor.diff:      platforms = stdenv.lib.platforms.unix;
       maintainers = [ stdenv.lib.maintainers.urkud ];
     };
  -}
  +} // stdenv.lib.optionalAttrs (!stdenv.isLinux) {
  +  NIX_CFLAGS_COMPILE = "-I${libiconv}/include";
  +
  +  NIX_CFLAGS_LINK = "-L${libiconv}/lib -liconv";
  +})
  
positive.code: { stdenv, fetchurl, popt, libiconvOrEmpty }:
  
  stdenv.mkDerivation rec {
    name = "libnatspec-0.2.6";
  
    src = fetchurl {
  
negative.code:     sha256 = "0zvm9afh1skxgdv62ylrpwyykpjhhskxj0zv7yrdf7jhfdriz0y3";
    };
  
    buildInputs = [ popt ];
  
    meta = {
      homepage = http://natspec.sourceforge.net/ ;
  