Bug#897409: dh-r: dh-update-R removed needed Build-Depends

[Andreas Tille]

Hi,

I dived a bit deeper into this issue and learned:

$ grep -i RcppArmadillo DESCRIPTION 
LinkingTo: Rcpp, RcppArmadillo

So at least r-cran-rcpparmadillo could be found if LinkingTo would
be evaluated.  Regarding foreign and nnet I've found

$ grep -ilR -e foreign -e nnet  * | grep -v ^debian 
inst/doc/DESeq2.html
inst/script/icobra_pkg_versions.txt

which is a bit hard to guess for dh-update-R.  Any idea how to find
out that r-cran-foreign and r-cran-nnet are needed Build-Depends?

Kind regards

       Andreas.

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