Query the main 'R' 'SVN' repository to find the versions 'r-release' and 'r-oldrel' refer to, and also all previous 'R' versions and their release dates.
copied from cf-post-staging / r-rversions
conda install conda-forge::r-rversionsconda install conda-forge/label/cf201901::r-rversionsconda install conda-forge/label/cf202003::r-rversionsconda install conda-forge/label/gcc7::r-rversions