anchor.diff:  stdenv.mkDerivation rec {
     name = "erlang-" + version + "${optionalString odbcSupport "-odbc"}"
     + "${optionalString javacSupport "-javac"}";
  -  version = "18.0";
  +  version = "18.2";
   
     src = fetchurl {
       url = "http://www.erlang.org/download/otp_src_${version}.tar.gz";
  -    sha256 = "1ahi865ii3iqzd00yyn3nrxjb9qa2by9d7ixssvqw8ag9firvdm0";
  +    sha256 = "1l1zzf245w1abiylll8pjm0pppqwvvw4fihknqkcybkx62n2ipj3";
     };
   
     buildInputs =
  
positive.code: 
    meta = {
      homepage = "http://www.erlang.org/";
      description = "Programming language used for massively scalable soft real-time systems";
  
      longDescription = ''
  
negative.code:   postInstall = let
      manpages = fetchurl {
        url = "http://www.erlang.org/download/otp_doc_man_${version}.tar.gz";
        sha256 = "0abaqnw6hkr1h1zw6cdqwg2k7rfmj2b9sqqldnqf3qaj0shz759n";
      };
    in ''
      ln -s $out/lib/erlang/lib/erl_interface*/bin/erl_call $out/bin/erl_call
  