compile question

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Hey Users,
Ghost here.
I have a compile question. I'm compiling gnubile and am running
into a compile problem. A good bit into my make, I am getting an error:

make[2]: Entering directory `/root/gnubile-0.31-pre/src'
gcc  -g -O2 -Wall  -o gnubile  main.o support.o interface.o callbacks.o admin.o download.o monitor.o search.o network.o stream_cli.o stream_serv.o stream_sched.o hexdump.o stream_log.o http.o textutils.o log.o ip.o dl.o uuid.o random.o atomicio.o bsd-misc.o -L/usr/lib -L/usr/X11R6/lib -lgtk -lgdk -rdynamic -lgmodule -lglib -ldl -lXi -lXext -lX11 -lm -lxml -lz
/usr/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
make[2]: *** [gnubile] Error 1
make[2]: Leaving directory `/root/gnubile-0.31-pre/src'
make[1]: *** [all-recursive] Error 1


I am unsure what this -lz is trying to do and how I correct this.
Any help much appriciated.

Thanks,

D. Ghost

'space ghost with a slice of lemon'