collect2: ld returned 1 exit status

[rkeane]

Hi,
When i tried to compile my code, there is an error:
collect2: ld returned 1 exit status
what is the reason causing this error?

ld: fatal: library -ldb-4: not found
ld: fatal: File processing errors. No output written to slapd
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `slapd'
Current working directory /var/tmp/openldap-2.3.32/servers/slapd
*** Error code 1
make: Fatal error: Command failed for target `all-common'
Current working directory /var/tmp/openldap-2.3.32/servers
*** Error code 1
make: Fatal error: Command failed for target `all-common'


Appreciate if anyone can help...