Installing MariaDB - where is wsrep-provider?

Other distributions provide a galera library, which position has to be set in the my.cnf file:

wsrep_provider=/usr/lib64/galera/libgalera_smm.so

On apline linux I can't find any library having "galera" in its name.

When starting MariaDB, the following output is logged:

[Note] WSREP: wsrep_load(): loading provider library 'none'

and WSREP is not available.

How can I fix that?

Thank You,
Marc