libstdc++6-32bit from devel:gcc:next project
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Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:gcc:next/openSUSE_Tumbleweed/devel:gcc:next.repo zypper refresh zypper install libstdc++6-32bit