libtevent-util0 from spins:invis:15:stable:samba project
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Add repository and install manually
For openSUSE Leap 15.1 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/spins:invis:15:stable:samba/openSUSE_Leap_15.1/spins:invis:15:stable:samba.repo zypper refresh zypper install libtevent-util0