R packages do not show up as requisites

[Pjotr Prins]

Funny thing,

  guix gc -R path

on a package that has python modules and R packages as inputs only the
python inputs show up. Try for example r-munsell which has
r-colorspace as an input:

  ./pre-inst-env guix package -i r-munsell

   r-munsell    0.4.2 → 0.4.2 
/gnu/store/kwhzqrpcm8agl8q2v9n19rss060xs2j4-r-munsell-0.4.2

  ./pre-inst-env guix gc -R 
/gnu/store/kwhzqrpcm8agl8q2v9n19rss060xs2j4-r-munsell-0.4.2

Niente, nop, nada. 

So you need R_LIBRARY_PATH set to run it. 

My problem is now that 'guix archive' won't include R modules because
they are not listed as requisites.

Is there an easy fix?

Pj.