dropbear and libnss

[Rich Turner]

i am using dropbear as part of a bootable cd. everything works fine when i 
include the libnss_files files but i am unable to authenticate without them. 
if i need libnss_files then why is not dropbear library dependent on 
libnss_files?

if i run ldd on all of the executables i include on the bootable cd, none are 
dependent on libnns_*.

is there something i do not understand about libnss and linux authentication 
or is dropbear trying to load a subroutine in libnss that does not exist?