How to check applications vs. libraries

[Daniel Tourde]

Hello,

I am used to install FreeBSD applications by using the port collection. I also 
update regularly (twice a month or something) the apps, 
using 'portupgrade -a -N' on a refreshed port collection.

Here are my questions:
- How can I check that the apps that have been build with certain libraries 
still work when some of the libs have been updated?
- Is it possible then to rebuild the selected set of apps that have 
been 'corrupted' by the library upgrade (classicaly from liba.1 to liba.2)? 
If yes, how?

or in other words, is there an equivalent to the Gentoo Linux 'revdep-rebuild' 
function?

Daniel