portupgrade on FreeBSD

These are good commands to try to resolve any compiling errors that are dependencies-related:

update your ports and make new index then do a portupgrade

portsnap fetch
portsnap update (do a portsnap extract instead only for the very first time)
cd /usr/ports
make fetchindex
portsdb -u
portversion -v -l "<" to see which apps are out of date
check /usr/ports/UPDATING for information you need to do before portupgrading
portupgrade -varR