Unknown token: logOption

i read about logOption at
http://net-snmp.sourceforge.net/docs/man/snmptrapd.conf.html but when i run
snmptrapd it gives me this warning:

/usr/local/etc/snmp/snmptrapd.conf: line 50: Warning: Unknown token:
logOption.

and snmpconf -R gives this output:

#
# Unknown directives read in from other files by snmpconf
#
logOption -Lf /var/log/traps_en_fichero.log

is this option not supported for the 5.1.4 version???