Reading warnings when installing multiple ports

[Kelly Jones]

I often use "make -DBATCH install" to install ports.

Problem: many ports spew out a warning/todo message after you install
them (eg, "you must manually create an x user" or something).

Since ports install "recursively", I miss most of these messages.

Can I tell ports to store these messages for me somewhere?

Obviously, I can "make -DBATCH install > /tmp/outfile", but that'll
log all the "install", "test", etc commands that I don't want to see:
I just want to see the warnings at the end of each install.

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