kaptoxic [1] filed a request to merge gnotero [2] into qnotero [3]: gnotero has been renamed to qnotero, which uses Qt instead of Gtk. It's available here: https://aur.archlinux.org/packages.php?O=0&K=qnotero
[1] https://aur.archlinux.org/account/kaptoxic/ [2] https://aur.archlinux.org/pkgbase/gnotero/ [3] https://aur.archlinux.org/pkgbase/qnotero/
