anchor.diff:  
   buildPythonPackage rec {
     pname = "glasgow";
  -  version = "unstable-2019-10-16";
  +  version = "unstable-2020-02-08";
     # python software/setup.py --version
  -  realVersion = "0.1.dev1286+g${lib.substring 0 7 src.rev}";
  +  realVersion = "0.1.dev1352+g${lib.substring 0 7 src.rev}";
   
     src = fetchFromGitHub {
       owner = "GlasgowEmbedded";
       repo = "glasgow";
  -    rev = "4f968dbe6cf4e9d8e2d0a5163d82e996c24d5e30";
  -    sha256 = "1b50n12dc0b3jmim5ywg7daq62k5j4wkgmwzk88ric5ri3b8dl2r";
  +    rev = "2a8bfc981b90ba5d86c310911dbd6ffe71acd498";
  +    sha256 = "01v5269bv09ggvmq6lqyhr5am51hzmwya1p5n62h84b7rdwd8q9m";
     };
   
     nativeBuildInputs = [ setuptools_scm sdcc ];
  
positive.code: 
    checkInputs = [ yosys icestorm nextpnr ];
  
    preBuild = ''
      make -C firmware LIBFX2=${fx2}/share/libfx2
      cp firmware/glasgow.ihex software/glasgow
  
negative.code:   doInstallCheck = false;
  
    checkPhase = ''
      python -W ignore::DeprecationWarning test.py
    '';
  
    makeWrapperArgs = [
  