For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bnavigator/openSUSE_Tumbleweed/home:bnavigator.repo
zypper refresh
zypper install libpangox-1_0-0
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bnavigator/openSUSE_Factory_ARM/home:bnavigator.repo
zypper refresh
zypper install libpangox-1_0-0
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bnavigator/15.6/home:bnavigator.repo
zypper refresh
zypper install libpangox-1_0-0