ERROR COMPILING QMAILADMIN

[tigrepop]

Dears managers.
I am installing qmailadmin
but it show me:
gcc -I. -I/usr/vpopmail/include     -g -O2 -c dotqmail.c
gcc  -g -O2  -o qmailadmin  qmailadmin.o alias.o autorespond.o forward.o
mailinglist.o sysadmin.o user.o util.o auth.o template.o command.o  show.o
cgi.o limits.o dotqmail.o -L/usr/vpopmail/lib -lvpopmail -lm 
/usr/bin/ld:
Unresolved:
snprintf
collect2: ld returned 1 exit status
*** Exit 1
Stop.
*** Exit 1
Stop.
*** Exit 1
Stop.


Is it Ok?
Why show me it?

Thanks