[Dovecot] dovecot 1.2.7 : configure: error: Can't build with LDAP support: libldap not found

hi

i have downloaded the dovecot 1.2.7 source when i tried to compile with ldap support it gives the error "configure: error: Can't build with LDAP support: libldap not found". i am attaching the log file with this mail. i want to use it with latest apacheDS.

Thanks in advance