can not restart with zlib error

I have amavisd since long time ago,
today, I've altered some x-spam tag values in
/etc/amavisd.conf;
when I tried to restart, I get this error:

how do I reinstall zlib ??
how it went missing...?

# service amavisd status
amavisd (pid 19876 19734 2671) is running...
amavis-milter is stopped

# service amavisd restart
Shutting down Mail Virus Scanner (amavisd):                [
 OK  ]
Starting Mail Virus Scanner (amavisd): ERROR: MISSING
REQUIRED BASIC MODULES:
  Compress::Zlib
BEGIN failed--compilation aborted at /usr/sbin/amavisd line
171.
                                                          
[FAILED]
# service amavisd start
Starting Mail Virus Scanner (amavisd): ERROR: MISSING
REQUIRED BASIC MODULES:
  Compress::Zlib
BEGIN failed--compilation aborted at /usr/sbin/amavisd line
171.
                                                          
[FAILED]
# service amavisd stop
Shutting down Mail Virus Scanner (amavisd):               
[FAILED]

# amavisd --version
ERROR: MISSING REQUIRED BASIC MODULES:
  Compress::Zlib
BEGIN failed--compilation aborted at /usr/sbin/amavisd line
171.


-- 
Voytek


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