mingw32-gcc from home:zeussuse:devel 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/home:zeussuse:devel/openSUSE_Tumbleweed/home:zeussuse:devel.repo zypper refresh zypper install mingw32-gcc