anchor.diff:      libxslt
       docbook_xsl
       python3
  +    itstool
     ];
   
     preFixup = ''
  
positive.code: { lib, stdenv
  , fetchFromGitHub
  , pkg-config
  , mono
  
negative.code: , libxslt
  , docbook_xsl
  , python3
  , itstool
  }:
  
  stdenv.mkDerivation rec {
  