How to see the dependency tree?

for example:

Code:
app1
 |  \
 |   \
lib1 lib2
       |
       |
      lib3(lib2 depends on lib3)


I want to see such a tree before or after an application is installed, any way?
Thanks.
 
Weaseal, there are a lot of make options for compiling ports. Are they, the options, documented anywhere? The only ones I use are install, clean, distclean, and missing. I am only talking about specific freebsd options, not ones like make-without-x.
 
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