anchor.diff:      "--with-gsoap-wsdl2h=${gsoap}/bin/wsdl2h"
     ];
   
  +  postFixup = ''
  +    ${lib.optionalString (externalEtc != null) ''
  +      mv "$out"/etc{,.orig}
  +      ln -s ${lib.escapeShellArg externalEtc} "$out/etc"
  +    ''}
  +  '';
  +
     meta = with lib; {
       description = "The C/C++ VOMS server, client and APIs v2.x";
       homepage = "https://italiangrid.github.io/voms/";
  
positive.code: , gsoap
  , openssl
  , zlib
  }:
  
  stdenv.mkDerivation rec{
  
negative.code:     repo = "voms";
      rev = "8e99bb96baaf197f0f557836e2829084bb1bb00e"; # develop branch
      hash = "sha256-FG4fHO2lsQ3t/ZaKT9xY+xqdQHfdtzi5ULtxLhdPnss=";
    };
  
    passthru = {
      inherit externalEtc;
    };
  
    nativeBuildInputs = [
  