anchor.diff:      repo = "voms";
       rev = "8e99bb96baaf197f0f557836e2829084bb1bb00e"; # develop branch
       hash = "sha256-FG4fHO2lsQ3t/ZaKT9xY+xqdQHfdtzi5ULtxLhdPnss=";
  +  };
  +
  +  passthru = {
  +    inherit externalEtc;
     };
   
     nativeBuildInputs = [
  
positive.code:     "--with-gsoap-wsdl2h=${gsoap}/bin/wsdl2h"
    ];
  
    meta = with lib; {
      description = "The C/C++ VOMS server, client and APIs v2.x";
      homepage = "https://italiangrid.github.io/voms/";
  
negative.code: , gsoap
  , openssl
  , zlib
    # Configuration overridable with .override
    # If not null, the builder will
    # move "$out/etc" to "$out/etc.orig" and symlink "$out/etc" to externalEtc.
  , externalEtc ? "/etc"
  }:
  
  stdenv.mkDerivation rec{
  