net-snmp: changed to configure the logfile if $auto_prefix is set

network/net-snmp/net-snmp.conf

@@ -14,6 +14,10 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+if [ $prefix_auto = 1 ]; then
+	var_append extraconfopt ' ' '--with-logfile="$localstatedir/log/snmpd.log"'
+fi
+
 # Use defaults for prompted values
 var_append confopt ' ' "--with-defaults"