"pace" complains that Gtk+-3.0 is missing

Today an update is failing because of a dependency is missing:

Dependency “gtk±3.0” not found

gtk3 is installed - which package contains gtk±3.0?

Best regards

What package is failing?

A repo package or AUR package?

An AUR package - pace. And during the repo-update there was an error, too pointing to libgtk-3.so.0 is missing. This was a hook of gtk-query-immodules-3.0 which occurs after the update of lib32-gtk3.