Install port dependencies from packages?

Hi,

Is there is a way to install all {BUILD,LIB,RUN} dependencies before
trying to build a port by using packages (pkg_add)? What I've been
doing is using the list provided by 'make {build,run,lib}-depends-list',
parsing the output and installing them manually. With the -a flag
from pkg_add I can later uninstall them easily, but I feel like
there's probably a better way.

Thank you.

Kind regards,
Johannes