anchor.diff:  { stdenv, fetchurl }:
   
  -let version = "2015c"; in
  +let version = "2015c";
   
  -stdenv.mkDerivation rec {
  +self = stdenv.mkDerivation rec {
     name = "tzdata-${version}";
   
     srcs =
  
positive.code:     platforms = stdenv.lib.platforms.all;
    };
  }
  
negative.code:       ln -s . $out/share/zoneinfo/posix
        mv $out/share/zoneinfo-leaps $out/share/zoneinfo/right
  
        mkdir -p "$out/include"
        cp tzfile.h "$out/include/tzfile.h"
      '';
  
    meta = {
  