anchor.diff:  
   buildPythonPackage rec {
     pname = "glasgow";
  -  version = "unstable-2019-09-28";
  -  # python setup.py --version
  -  realVersion = "0.1.dev1234+g${lib.substring 0 7 src.rev}";
  +  version = "unstable-2019-10-16";
  +  # python software/setup.py --version
  +  realVersion = "0.1.dev1286+g${lib.substring 0 7 src.rev}";
   
     src = fetchFromGitHub {
       owner = "GlasgowEmbedded";
  -    repo = "Glasgow";
  -    rev = "a1cc0333315847980806fd0330021c6de05c5395";
  -    sha256 = "0rdx7fymz828i73bc559sr67aikydz1m8s2a0i6c86gznh1s3cfk";
  +    repo = "glasgow";
  +    rev = "4f968dbe6cf4e9d8e2d0a5163d82e996c24d5e30";
  +    sha256 = "1b50n12dc0b3jmim5ywg7daq62k5j4wkgmwzk88ric5ri3b8dl2r";
     };
   
     nativeBuildInputs = [ setuptools_scm sdcc ];
  
positive.code:     crcmod
    ];
  
    preBuild = ''
      make -C firmware LIBFX2=${fx2}/share/libfx2
      cp firmware/glasgow.ihex software/glasgow
  
negative.code:     python -m unittest discover
    '';
  
    makeWrapperArgs = [
      "--set" "YOSYS" "${yosys}/bin/yosys"
      "--set" "ICEPACK" "${icestorm}/bin/icepack"
      "--set" "NEXTPNR_ICE40" "${nextpnr}/bin/nextpnr-ice40"
    ];
  
    meta = with lib; {
      description = "Software for Glasgow, a digital interface multitool";
      homepage = https://github.com/GlasgowEmbedded/Glasgow;
  