Note: I just use 
ports-mgmt/portmaster now
Sync ports tree
csup ports-supfile
Update INDEXes
portsdb -Uu pkgdb -u
Get a list of out-of-date ports
pkg_version -vl '<' | cut -d' ' -f1
Pull dependency information for each out-of-date port (Children must be rebuilt/reinstalled as well)
pkg_info -Rq
Do this recursively, keeping track of the depth. Once you hit bottom on all the ports and their descendants, squash the depgraph, placing deeper dependencies later. I.e.:
A -B -C --D E -B -D =becomes= A E B C D ==
BASH script is at CheckPorts.sh
Once you have a list of ports to install, and their order, you can use a convenience function in sh to build a package
makepkg() {
rm *.tbz
make all deinstall install package clean && mv -v *.tbz /build/pkg/
}