pkgsrc license question

[Brook Milligan <brook%nmsu.edu@localhost>]

I have a question regarding the license to choose for a package.  It comes with 
a license file that is almost identical to the modified BSD license.  The sole 
difference is the insertion of the following sentence at the beginning of the 
last paragraph:

        NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED 
BY THIS LICENSE.

Does this constitute a separate license or is this "close enough" to the 
modified BSD license that it can be referenced by the package?  Thanks for your 
guidance.

Cheers,
Brook