Edit leaf.cfg and add snmpd, libsnmp and libm to the packages list:

root,config,etc, ... , libm,libsnmp,netsnmpd

Either reboot the system or load the new packages manually.

Edit the configuration file /etc/snmp/snmpd.conf. A sample configuration is given below. This sample does not contain all the helpful comments from the original configuration file, so I suggest you use this to edit your existing configuration file.

#
# snmpd.conf
#

syscontact  "Root <zaphod@heart.of.gold>"
syslocation  "At the end of the Universe"
sysname leafhost
sysservices 15

rocommunity  zaphod     default
com2sec      readonly   default    zaphod
group        RO_Group   usm   readonly
group        RO_Group   v1    readonly
group        RO_Group   v2c   readonly
view         all    included   .1

access  RO_Group   ""       any        noauth     exact  all     none   none

# 

Now backup the netsnmpd package and (re)start start snmpd with svi snmpd restart.