make error /usr/bin/ld: cannot find -lz

[rashad]

Install zlib library for your system.

>make faild with this error...
>
>gcc -shared sql_mysql.lo -L/usr/lib -L/usr/lib/mysql
/usr/lib/libmysqlclient.so -lz -lm -lssl -lcrypto -Wl,-soname -Wl,rlm_sql_my
sql-1.0.1.so -?>o .libs/rlm_sql_mysql-1.0.1.so
>/usr/bin/ld: cannot find -lz
>collect2: ld returned 1 exit status
>gmake[10]: *** [rlm_sql_mysql.la] Error 1
>
>What is -lz ?