For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:wxWidgets/openSUSE_Tumbleweed/X11:wxWidgets.repo
zypper refresh
zypper install wxWidgets-3_0-nostl
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:wxWidgets/openSUSE_Factory_ARM/X11:wxWidgets.repo
zypper refresh
zypper install wxWidgets-3_0-nostl
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/X11:wxWidgets/15.4/X11:wxWidgets.repo
zypper refresh
zypper install wxWidgets-3_0-nostl