anchor.diff:      # This might not hold for e.g. BSD.
       "--with-sysdep-devurandom=yes"
       (if stdenv.isDarwin
  -      then "--disable-shared"
  -      else "--enable-shared")
  +    then "--disable-shared"
  +    else "--enable-shared")
     ]
       # On darwin, the target triplet from -dumpmachine includes version number,
       # but skarnet.org software uses the triplet to test binary compatibility.
  
positive.code:   # : lines
  , postInstall
    # : list Maintainer
  , maintainers ? []
    # : passtrhu arguments (e.g. tests)
  , passthru ? {}
  
  }:
  
  
negative.code:     "CONTRIBUTING"
    ];
  
  in
  stdenv.mkDerivation {
    inherit pname version;
  
    src = fetchurl {
  