anchor.diff:  mkDerivation {
     name = "${pname}-${version}";
   
  -  src = fetchurl {
  -    url = "https://www.texmacs.org/Download/ftp/tmftp/source/TeXmacs-${version}-src.tar.gz";
  -    sha256 = "1zbl1ddhppgnn3j213jl1b9mn8zmwnknxiqswm25p4llj0mqcgna";
  +  src = fetchFromGitHub {
  +    owner = "texmacs";
  +    repo = "texmacs";
  +    rev = "v${version}";
  +    sha256 = "04585hdh98fvyhj4wsxf69xal2wvfa6lg76gad8pr6ww9abi5105";
     };
   
     enableParallelBuilding = true;
  
positive.code: { lib, mkDerivation, callPackage, fetchurl, fetchpatch,
    guile_1_8, qtbase, xmodmap, which, freetype,
    libjpeg,
    sqlite,
  
negative.code: 
  let
    pname = "TeXmacs";
    version = "1.99.15";
    common = callPackage ./common.nix {
      inherit tex extraFonts chineseFonts japaneseFonts koreanFonts;
    };
  