[CentOS] creating RPMs from CRAN tarballs

This is not specifically a CentOS question, but I am creating RPMS for CentOS 6 from some CRAN tarballs.

I run R2spec -s tarball to create a spec file, and most of the time it works ok, but sometimes (RPostgresSQL, Rcpp for example) the package has test or example programs that start with

#!/usr/bin/r

with lower case r, and the resulting package then winds up with a dependency on /usr/bin/r, which can't be resolved.

So far I have solved it by editing all the files and replacing with /usr/bin/R, recreating the tarball and going through the process again, but I have to believe there is an easier way.

Is there a option to not create the dependency?

Thanks Tony Schreiner