@Lannakin: that's an error occurring during installation, isn't it? Looks like you have added an additional pacman repository providing this package, and there is some signature issue. Either way, that has nothing to do with the package itself. Could you build it yourself instead?
EDIT: this package is definitely in the archlinuxcn repo, have a look here (regarding the keyring in particular): https://wiki.archlinux.org/index.php/Unofficial_user_repositories#archlinuxcn
Pinned Comments
Corax commented on 2019-06-10 18:11 (UTC)
Make sure you have the multilib-devel group installed before reporting issues while building the package. I will not add it as a makedepends because it is not a makedepends for lib32-ncurses5 either. See https://wiki.archlinux.org/index.php/Makepkg#Build_32-bit_packages_on_a_64-bit_system
Corax commented on 2016-08-19 23:33 (UTC) (edited on 2022-02-28 18:45 (UTC) by Corax)
If anyone is still having trouble getting used to PGP signing, make sure to add the key mentioned in the PKGBUILD: