error install

[Adhitiyo K]

dear folks I install vpopmail + sqwebmail + qmail 1. I install vpopmail-4.9.10 + sqwebmail-2.1.1 i got error like this :                 /var/spool/mail/vpopmail/lib/libvpopmail.a(vauth.o): In function `vauth_open':         /home/build/vpopmail-4.9.10/vauth.c:70: undefined reference to `mysql_init'         /home/build/vpopmail-4.9.10/vauth.c:72: undefined reference to `mysql_real_connect'         /home/build/vpopmail-4.9.10/vauth.c:74: undefined reference to `mysql_real_connect'         /var/spool/mail/vpopmail/lib/libvpopmail.a(vauth.o): In function `vupdate_rules':         /home/build/vpopmail-4.9.10/vauth.c:620: undefined reference to `mysql_free_result'         /var/spool/mail/vpopmail/lib/libvpopmail.a(vauth.o): In function `vcreate_dir_control':         /home/build/vpopmail-4.9.10/vauth.c:924: undefined reference to `mysql_free_result'         collect2: ld returned 1 exit status         make[1]: *** [authvchkpw] Error 1         make[1]: Leaving directory `/home/build/sqwebmail-2.1.1/authlib'         make: *** [all-recursive] Error 1      2. vpopmail-4.9.10+sqwebmail-3.0.0 i got error like this :             authvchkpw.c: In function `auth_vchkpw_changepass':         authvchkpw.c:142: warning: assignment from incompatible pointer type         authvchkpw.c:151: dereferencing pointer to incomplete type         authvchkpw.c:151: dereferencing pointer to incomplete type         gmake[1]: *** [authvchkpw.o] Error 1         gmake[1]: Leaving directory `/home/build/sqwebmail-3.0.0/authlib'         gmake: *** [all-recursive] Error 1 3 vpopmail-4.10.30 + sqwebmail-3.0.0 the error while read open_smtp_relay   why thats happen ... from my system or what ....   tio