anchor.diff:     https://archive.linux.duke.edu/cran/src/contrib/Archive/roxygen2/roxygen2_5.0.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/rversions_1.0.3.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/git2r_0.25.2.tar.gz \
  +   
      https://archive.linux.duke.edu/cran/src/contrib/devtools_2.0.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/R6_2.4.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/httr_1.4.0.tar.gz \
  
positive.code:     https://archive.linux.duke.edu/cran/src/contrib/styler_1.0.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/lintr_1.0.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/testthat_2.0.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/pkgbuild_1.0.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/pkgload_1.0.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/rcmdcheck_1.2.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/sessioninfo_1.0.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/usethis_1.4.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/fs_1.2.6.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/reprex_0.2.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/gh_1.0.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/microbenchmark_1.4-4.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/modelr_0.1.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/clipr_0.4.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/callr_3.0.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/processx_3.2.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/ps_1.1.0.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/globals_0.12.2.tar.gz \
  
negative.code:     styler_1.0.2.tar.gz \
      lintr_1.0.2.tar.gz \
      testthat_2.0.0.tar.gz \
      fs_1.2.6.tar.gz \
      reprex_0.2.0.tar.gz \
      gh_1.0.1.tar.gz \
  