The wx error is nothing to worry about. 3.1.0 is a development version so we won't have it in our repos, and dolphin builds its own anyway.
The gthread error I can't reproduce, neither locally nor in a clean chroot, which means there's a problem with your particular system. Did you perhaps temper with glib2?
Pinned Comments
dpeukert commented on 2020-04-10 12:34
The PKGBUILD for this package is hosted here (contributions are welcome!): https://gitlab.com/dpeukert/pkgbuilds/tree/main/dolphin-emu-git