anchor.diff:      mimeType = "text/plain";
     };
   
  -  installPhase =
  -  ''
  -     mkdir -p "$prefix/usr/lib/zotero-bin-${version}"
  -     cp -r * "$prefix/usr/lib/zotero-bin-${version}"
  -     mkdir -p "$out/bin"
  -     ln -s "$prefix/usr/lib/zotero-bin-${version}/zotero" "$out/bin/"
  +  installPhase = ''
  +    runHook preInstall
   
  -     # install desktop file and icons.
  -     mkdir -p $out/share/applications
  -     cp ${desktopItem}/share/applications/* $out/share/applications/
  -     for size in 16 32 48 256; do
  -       install -Dm444 chrome/icons/default/default$size.png \
  -         $out/share/icons/hicolor/''${size}x''${size}/apps/zotero.png
  -     done
  +    mkdir -p "$prefix/usr/lib/zotero-bin-${version}"
  +    cp -r * "$prefix/usr/lib/zotero-bin-${version}"
  +    mkdir -p "$out/bin"
  +    ln -s "$prefix/usr/lib/zotero-bin-${version}/zotero" "$out/bin/"
   
  -     for executable in \
  -       zotero-bin plugin-container \
  -       updater minidump-analyzer
  -     do
  -       if [ -e "$out/usr/lib/zotero-bin-${version}/$executable" ]; then
  -         patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
  -           "$out/usr/lib/zotero-bin-${version}/$executable"
  -       fi
  -     done
  -     find . -executable -type f -exec \
  -       patchelf --set-rpath "$libPath" \
  -         "$out/usr/lib/zotero-bin-${version}/{}" \;
  +    # install desktop file and icons.
  +    mkdir -p $out/share/applications
  +    cp ${desktopItem}/share/applications/* $out/share/applications/
  +    for size in 16 32 48 256; do
  +      install -Dm444 chrome/icons/default/default$size.png \
  +        $out/share/icons/hicolor/''${size}x''${size}/apps/zotero.png
  +    done
  +
  +    for executable in \
  +      zotero-bin plugin-container \
  +      updater minidump-analyzer
  +    do
  +      if [ -e "$out/usr/lib/zotero-bin-${version}/$executable" ]; then
  +        patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
  +          "$out/usr/lib/zotero-bin-${version}/$executable"
  +      fi
  +    done
  +    find . -executable -type f -exec \
  +      patchelf --set-rpath "$libPath" \
  +        "$out/usr/lib/zotero-bin-${version}/{}" \;
  +
  +    runHook postInstall
     '';
   
     preFixup = ''
  
positive.code:       stdenv.cc.cc
      ];
  
    patchPhase = ''
      sed -i '/pref("app.update.enabled", true);/c\pref("app.update.enabled", false);' defaults/preferences/prefs.js
    '';
  
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "zotero";
    version = "5.0.95";
  
    src = fetchurl {
      url = "https://download.zotero.org/client/release/${version}/Zotero-${version}_linux-x86_64.tar.bz2";
      sha256 = "16rahl14clgnl7gzpw7rxx23yxbw1nbrz219q051zkjkkw5ai8lv";
    };
  
    nativeBuildInputs = [ wrapGAppsHook ];
  