proftpd+mysql????

cnllq

[root@ZHANG proftpd-1.2.7]# make
cd lib ; make lib
make[1]: Entering directory `/var/tmp/proftpd-1.2.7/lib'
make[1]: Nothing to be done for `lib'.
make[1]: Leaving directory `/var/tmp/proftpd-1.2.7/lib'
cd src ; make src
make[1]: Entering directory `/var/tmp/proftpd-1.2.7/src'
make[1]: Nothing to be done for `src'.
make[1]: Leaving directory `/var/tmp/proftpd-1.2.7/src'
cd modules; make modules
make[1]: Entering directory `/var/tmp/proftpd-1.2.7/modules'
make[1]: Nothing to be done for `modules'.
make[1]: Leaving directory `/var/tmp/proftpd-1.2.7/modules'
gcc -Llib  -o proftpd src/main.o src/timers.o src/sets.o src/pool.o src/regexp.o src/dirtree.o src/support.o src/inet.o src/log.o src/scoreboard.o src/netio.o src/ident.o src/data.o src/modules.o src/auth.o src/fs.o modules/mod_core.o modules/mod_xfer.o modules/mod_unixpw.o modules/mod_auth.o modules/mod_ls.o modules/mod_log.o modules/mod_site.o modules/mod_sql_mysql.o modules/mod_sql.o  modules/module_glue.o -lsupp -lcrypt  -lm -lz -lmysqlclient
/usr/bin/ld: cannot find -lz
collect2: ld returned 1 exit status
make: *** [proftpd] Error 1


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?????? wo xiang zhi dao wei shi me