[Dovecot] LMTP plugin with MySQL query

Hello, I want to create a plugin to dovecot 2.0.1, to call a on the deliver action. My plugin work even if I include other libs like mysql or wathever

I tried to use the "sql-api.h" (lib-sql), but at runtime, I have : "undefined symbol: sql_init", "Fatal: Couldn't load required plugins"

Is it possible to use lib-sql api or mysql libs in a plugin ?

I've tried with lda or lmtp plugin with the same result...

Any idea ?

Charly.