anchor.diff:  , python
   , libffi
   , libbfd
  +, libpfm
   , libxml2
   , ncurses
   , version
  
positive.code: , enableManpages ? false
  , enableSharedLibraries ? true
  , enableWasm ? true
  }:
  
  let
  
negative.code:   nativeBuildInputs = [ cmake python ]
      ++ stdenv.lib.optional enableManpages python.pkgs.sphinx;
  
    buildInputs = [ libxml2 libffi ]
      ++ stdenv.lib.optional enablePFM libpfm; # exegesis
  
    propagatedBuildInputs = [ ncurses zlib ];
  
  