Yet another unable to load auth-plugin. about mosquitto-auth-plug

[jpmens]

You have not told the plugin which backend to use!

auth_opt_backends

[jpmens]

undefined symbol: deflate sounds like linking with -lz is missing

[jpmens]

or is it -lzlib?

[AggelosGroumas]

Thanks for your response. I was putting the -lz flag in the wrong place so i had the illusion i was linking.
For future readers: Modify LDADD variable adding "-lz" at the end.

Now i get however:
1422613437: Config loaded from mosquitto.conf.
1422613437: |-- *** auth-plug: startup
|-- No backends configured.
|-- *** ABORT.

[jpmens]

|-- No backends configured.
|-- *** ABORT.

Looks pretty self-explanatory to me.

[AggelosGroumas]

Yes i know, the thing is i had a mysql backend configured
I used the .sql script located in the examples folder.

conf file is:
pid_file ./mosquitto.pid

persistence true
persistence_file mosquitto.db
persistence_location /tmp/
connection_messages true
log_timestamp true
log_dest stderr

log_type debug

listener 1883

auth_plugin /usr/lib/x86_64-linux-gnu/auth-plug.so
auth_opt_host localhost
auth_opt_port 3306
auth_opt_dbname test
auth_opt_user root
auth_opt_pass root
auth_opt_userquery SELECT pw FROM users WHERE username = '%s'
auth_opt_superquery SELECT COUNT(*) FROM users WHERE username = '%s' AND super = 1
auth_opt_aclquery SELECT topic FROM acls WHERE (username = '%s') AND (rw >= %d)

[AggelosGroumas]

Indeed that slipped through.
Thank you very much for your time!