Warning: Unknown token: extend

hi

i am new to net-snmp so may by i am asking a stupid question but what
means this warning ?
is it mistake of compilation or is it missing some files ?

#snmpd -c snmpd5.conf -Le -D
snmpd5.conf: line 4: Warning: Unknown token: extend.            
NET-SNMP version
5.5                                                           

its same with exec
                         
# cat snmpd5.conf                                               
rocommunity 
public                                                            
syslocation  "SNMPD test"                                            
syscontact  [email protected]                                                  
extend echotest /bin/echo hello world


thanks

Peter

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