anchor.diff:     https://archive.linux.duke.edu/cran/src/contrib/usethis_1.4.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/sys_3.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/askpass_1.1.tar.gz \
  -   https://archive.linux.duke.edu/cran/src/contrib/openssl_1.2.2.tar.gz \
  +   https://archive.linux.duke.edu/cran/src/contrib/openssl_1.3.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/brew_1.0-6.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/fs_1.2.7.tar.gz \
  
positive.code:    https://archive.linux.duke.edu/cran/src/contrib/ps_1.3.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/callr_3.2.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/crayon_1.3.4.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/assertthat_0.2.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/cli_1.1.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/desc_1.2.0.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/prettyunits_1.0.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/backports_1.1.3.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rprojroot_1.3-2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/withr_2.1.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/pkgbuild_1.0.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rlang_0.3.1.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rstudioapi_0.10.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/pkgload_1.0.2.tar.gz \
     https://archive.linux.duke.edu/cran/src/contrib/rcmdcheck_1.3.2.tar.gz \
  
negative.code:    processx_3.3.0.tar.gz \
     callr_3.2.0.tar.gz \
     crayon_1.3.4.tar.gz \
     assertthat_0.2.1.tar.gz \
     cli_1.1.0.tar.gz \
     backports_1.1.3.tar.gz \
     rprojroot_1.3-2.tar.gz \
     desc_1.2.0.tar.gz \
     prettyunits_1.0.2.tar.gz \
     withr_2.1.2.tar.gz \
     pkgbuild_1.0.3.tar.gz \
     rlang_0.3.3.tar.gz \
     rstudioapi_0.10.tar.gz \
     pkgload_1.0.2.tar.gz \
     xopen_1.0.0.tar.gz \
  