R2spec woes

I tried R2spec to create the spec files necessary to have Rcpparmadillo.

I noticed that it has some issues, one example is that it placed some files 
irrespectively if they were present in the tar or not.

One functionality that I think it would be nice to have would to update a 
given spec file with the updated dependencies.

What do you think of this?

Regards,

Jos? Ab?lio
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