Difficulties installing sqwebmail

Hi, I'm just subscribing this mailing list today, because I need some help.
I'm trying to install sqwebmail-4.0.7 and get this error when running configure :
configure: error: Cannot find either the gdbm or the db library

When I run rpm -qa gdbm, there's gdbm-1.8.0-18 installed
I've surfed the net and still don't find anything related to this.
Does anyone know how to solve this problem ? Where can I find documentation about installing sqwebmail ?

FYI, I have qmail and vpopmail running well, and now I want to use sqwebmail for some users accessing mail.

Thanks in advance
Liung's