libstdc++6-32bit from home:aevseev:devel project
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Add repository and install manually
For openSUSE-15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:aevseev:devel/openSUSE-15.4/home:aevseev:devel.repo zypper refresh zypper install libstdc++6-32bit