~dricottone/pkgbuilds

ref: 7cf9074a9b3ba9e3aa6fead1b142eda5c689056d pkgbuilds/r-units d---------
Initial commit

A long journey to packaging r-tidyverse. The current highest-level
packages that are successfully built are dtplyr, waldo, callr, and xml2.
A handful of others (brio, digest, praise, units, zeallot) are currently
freestanding but will become dependencies soon.