anchor.diff:    buildInputs = [ sysfsutils ]
       ++ optionals withGcrypt        [ libgcrypt ]
       ++ optionals withJitterEntropy [ jitterentropy ]
  -    ++ optionals withNistBeacon    [ openssl curl libxml2 ]
  +    ++ optionals withNistBeacon    [ curl libxml2 openssl ]
       ++ optionals withPkcs11        [ libp11 openssl ];
   
     # This shouldn't be necessary but is as of 6.7
  
positive.code: 
    postPatch = ''
      cp README.md README
    '';
  
    nativeBuildInputs = [ autoreconfHook libtool pkgconfig ];
  
negative.code:   # Not sure if jitterentropy is safe to use for cryptography
    # and thus a default entropy source
  , jitterentropy ? null, withJitterEntropy ? false
  , libp11 ? null, opensc ? null, withPkcs11 ? true
  }:
  
  with stdenv.lib;
  