ngtcp2 from spins:invis:15:unstable:samba project
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Add repository and install manually
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:unstable:samba/16.0/spins:invis:15:unstable:samba.repo zypper refresh zypper install ngtcp2