anchor.diff:    meta = with stdenv.lib; {
       description = "A minimal Markdown reading & writing app";
       homepage = https://typora.io;
  -    license = licenses.free;
  -    maintainers = with stdenv.lib.maintainers; [ jensbin ];
  +    license = licenses.unfree;
  +    maintainers = with maintainers; [ jensbin ];
       platforms = [ "x86_64-linux" "i686-linux" ];
     };
   }
  -
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "typora-${version}";
    version = "0.9.31";
  
    src =
      if stdenv.system == "x86_64-linux" then
        fetchurl {
          url = "https://www.typora.io/linux/typora_${version}_amd64.deb";
          sha256 = "786b5164d9c63ecc23eb427c5ff393285ce8fd540c5bfdd5c1464655fac87a42";
        }
      else
        fetchurl {
          url = "https://www.typora.io/linux/typora_${version}_i386.deb";
          sha256 = "a8fe53f8984d9f8c4e06c14affbb616be58a91cd2b475b9681fb18a6e21930d1";
        }
      ;
  
  
negative.code:   installPhase = ''
      mkdir -p $out
      dpkg -x $src $out
      mv $out/usr/bin $out
      mv $out/usr/share $out
      rm $out/bin/typora
      rmdir $out/usr
  
      # Otherwise it looks "suspicious"
      chmod -R g-w $out
  