anchor.diff:  , python3
   , readline
   , stdenv
  -, which
   , yosys
   , zlib
   , yosys-symbiflow
  
positive.code:   inherit src version plugin;
    enableParallelBuilding = true;
  
    nativeBuildInputs = [ which python3 ];
    buildInputs = [ yosys readline zlib uhdm surelog ];
  
    # xdc has an incorrect path to a test which has yet to be patched
  
negative.code:   src = fetchFromGitHub {
      owner  = "chipsalliance";
      repo   = "yosys-f4pga-plugins";
      rev    = "27208ce08200a5e89e3bd4f466bc68824df38c32";
      hash   = "sha256-S7txjzlIp+idWIfp/DDOznluA3aMFfosMUt5dvi+g44=";
    };
  
    version = "2022.09.27";
  
    # Supported symbiflow plugins.
    #
  