utility to compare 2 dir trees

[Fbsd8]

Adam Vande More wrote:
> On Mon, Dec 31, 2012 at 7:23 PM, Fbsd8 <fbsd8 at a1poweruser.com> wrote:
> 
>> I want to compare 2 different directory trees to each other to locate any
>> differences in directories and files contained there in.
>>
>> Any suggestions?
>>
> 
> mtree(8)
> 


 From the man page I don't see how to code mtree to compare 2 different 
directory trees against each other.