anchor.diff:      description = "Replacement for the old crypt() package and crypt(1) command, with extensions";
       homepage = http://mcrypt.sourceforge.net;
       license = "GPL";
  +    platforms = platforms.all;
     };
   }
  
positive.code:     sha256 = "0gipgb939vy9m66d3k8il98rvvwczyaw2ixr8yn6icds9c3nrsz4";
    };
  
    buildInputs = [];
  
    configureFlags = optional disablePosixThreads
      [ "--disable-posix-threads" ];
  
negative.code: { stdenv, fetchurl, darwin, disablePosixThreads ? false }:
  
  with stdenv.lib;
  
  