anchor.diff:  
   lib.fix (self:
   let
  -  version = "1.2.28";
  +  version = "1.2.30";
   in
   stdenv.mkDerivation {
     pname = "xmlsec";
  
positive.code: 
    enableParallelBuilding = true;
    doCheck = true;
  
    # enable deprecated soap headers required by lasso
    # https://dev.entrouvert.org/issues/18771
  
negative.code: 
    src = fetchurl {
      url = "https://www.aleksey.com/xmlsec/download/xmlsec1-${version}.tar.gz";
      sha256 = "1j5bf7ni45jghyrbf7a14wx2pvfara557zyry7g7h8840c5kd11d";
    };
  
    patches = [
  