anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "mailspring";
  -  version = "1.8.0";
  +  version = "1.9.0";
   
     src = fetchurl {
       url = "https://github.com/Foundry376/Mailspring/releases/download/${version}/mailspring-${version}-amd64.deb";
  -    sha256 = "BtzYcHN87qH7s3GiBrsDfmuy9v2xdhCeSShu8+T9T3E=";
  +    sha256 = "ISwNFR8M377+J7WoG9MlblF8r5yRTgCxEGszZCjqW/k=";
     };
   
     nativeBuildInputs = [
  
positive.code:   ];
  
    unpackPhase = ''
      dpkg -x $src .
    '';
  
    installPhase = ''
      mkdir -p $out/{bin,lib}
      cp -ar ./usr/share $out
  
  
negative.code: 
      ln -s $out/share/mailspring/mailspring $out/bin/mailspring
      ln -s ${openssl.out}/lib/libcrypto.so $out/lib/libcrypto.so.1.0.0
  
      runHook postInstall
    '';
  
    postFixup = /* sh */ ''
      substituteInPlace $out/share/applications/Mailspring.desktop \
        --replace Exec=mailspring Exec=$out/bin/mailspring
    '';
  
    meta = with lib; {
  