anchor.diff:  
   let
     pname = "icu4c";
  -  version = "58.2";
  -
  -  # this patch should no longer be needed in 58.3
  -  # https://bugs.gentoo.org/show_bug.cgi?id=599142#c14
  -  keywordFix = fetchurl {
  -    url = "http://bugs.icu-project.org/trac/changeset/39484?format=diff";
  -    name = "icu-changeset-39484.diff";
  -    sha256 = "0hxhpgydalyxacaaxlmaddc1sjwh65rsnpmg0j414mnblq74vmm8";
  -  };
  +  version = "59.1";
   in
   stdenv.mkDerivation {
     name = pname + "-" + version;
  
positive.code:     sourceRoot=''${sourceRoot}/source
      echo Source root reset to ''${sourceRoot}
    '';
  
    patchFlags = "-p4";
  
    patches = [ keywordFix ];
  
    preConfigure = ''
      sed -i -e "s|/bin/sh|${stdenv.shell}|" configure
  
negative.code:   src = fetchurl {
      url = "http://download.icu-project.org/files/${pname}/${version}/${pname}-"
        + (stdenv.lib.replaceChars ["."] ["_"] version) + "-src.tgz";
      sha256 = "1zkmbg2932ggvpgjp8pys0cj6z8bw087y8858009shkrjfpzscki";
    };
  
    outputs = [ "out" "dev" ];
  