I filed a PR for this some months back, it is possible to build it w/o 
Perl... cd /usr/ports/net-mgmt/net-snmp ; make WITHOUT_PERL=1

Ryan Mullins wrote:

>I know the net-snmp port puts the agent on the system that will allow you to do what you want, but
I think it requires that perl is installed on the system.  Then again, I may be wrong on that one as
I haven't played with it in quite some time.  I'm sure there is a small port out there that will
allow this that doesn't require perl installed.  
>  
>