Since you've chosen to use Zebra, you can enable the SRU/
Z39.50 Server if you so choose, but you must specify a
few configuration options for it.

Please note that if you choose *NOT* to configure SRU,
koha-conf.xml will still contain some references to SRU
settings. Those references will be ignored by Koha.

Install the SRU configuration files? (no, yes) [yes]

SRU Database host? [localhost]

SRU port for bibliographic data? [9998]

SRU port for authority data? [9999]