mingw64-libigloo from multimedia:xiph:nightly-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/multimedia:xiph:nightly-devel/openSUSE_Tumbleweed/multimedia:xiph:nightly-devel.repo zypper refresh zypper install mingw64-libigloo