How to mass recompile broken packages?

[Unga]

Hi all

I'm using FreeBSD 8.1 on i386 machine.

I have upgraded a package using portmanager, but the upgrade seems not successful.

The required package is upgraded but all packages depend on the upgraded package were not recompiled.

I have two questions regarding this:
1. How to list all packages that are broken now?

2. How to mass recompile all broken packages?

Best regards
Unga