R packages can not be built reproducibly. The username and build time gets written to the `Packaged` field in `package.rds`. The build time also gets written to the `Built` field of the `DESCRIPTION` file.

Example packages:

 * [[https://reproducible.debian.net/userContent/rb-pkg/r-cran-mvnormtest.html|r-cran-mvnormtest]]
 * [[https://reproducible.debian.net/userContent/rb-pkg/r-cran-digest.html|r-cran-digest]]
 * ~ 180 such packages in total

= Solution =

Possible solution sent as Bug:774031