hi guys thank you for your help and advice I solve the problem installing the portsnap then I try to install the /usr/ports/net-mgmt/net-snmp
make install
but I have an error messege from the makefile it was a conflig with an packet version of perl so I continue to deinstalling perl and all the dependences after that I try to execute the make install again and thats all it finished the process successfully
so the problem was the net-snmp packets version Im traying to understand what happened
thanks guys and sorry about my english