Rebuilding png and perl without rebuilding a whole lot of ports twice.

[Thomas Mueller]

I have to portupgrade/portmaster both graphics/png and lang/perl, and these both require rebuilding all ports that depend on these two.

Question is how to do this without rebuilding all these ports twice, redundantly, as might happen if I do

        portmaster -o lang/perl5.16 lang/perl5.12

        Conservative:
        portmaster p5-

        Comprehensive (but perhaps overkill):
        portmaster -r perl-

and


  If you use portmaster:
        portmaster -r png-

I currently have perl-threaded-5.14.1_2 .

There are a whole lot of things that I want to upgrade: seamonkey, gnash, hplip, ffmpeg, vlc and many others, so may be nice do have them done en masse, but preferably not twice each.

Tom