anchor.diff:    NIX_CFLAGS_COMPILE = [ "-Wno-error=format-truncation" "-Wno-error=stringop-truncation" ];
   
     # disable dvbscan, as having it enabled causes a network download which
  -  # cannot happen during build.
  +  # cannot happen during build.  We now include the dtv-scan-tables ourselves
     configureFlags = [
       "--disable-dvbscan"
       "--disable-bintray_cache"
  
positive.code: 
      substituteInPlace src/config.c \
        --replace /usr/bin/tar ${gnutar}/bin/tar
  
      # the version detection script `support/version` reads this file if it
      # exists, so let's just use that
  
negative.code: { stdenv, fetchFromGitHub, cmake, makeWrapper, pkgconfig
  , avahi, dbus, gettext, git, gnutar, gzip, bzip2, ffmpeg_3, libiconv, openssl, python
  , v4l-utils, which, zlib }:
  
  let
    version = "4.2.8";
  
    dtv-scan-tables = stdenv.mkDerivation {
      pname = "dtv-scan-tables";
      version = "2020-05-18";
      src = fetchFromGitHub {
        owner = "tvheadend";
        repo = "dtv-scan-tables";
        rev = "e3138a506a064f6dfd0639d69f383e8e576609da";
        sha256 = "19ac9ds3rfc2xrqcywsbd1iwcpv7vmql7gp01iikxkzcgm2g2b6w";
      };
      nativeBuildInputs = [ v4l-utils ];
      installFlags = [ "DATADIR=$(out)" ];
    };
  in stdenv.mkDerivation {
    pname = "tvheadend";
    inherit version;
  