anchor.diff:     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 \
      https://archive.linux.duke.edu/cran/src/contrib/remotes_2.0.2.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/sessioninfo_1.1.1.tar.gz \
      https://archive.linux.duke.edu/cran/src/contrib/usethis_1.4.0.tar.gz \
  -   https://archive.linux.duke.edu/cran/src/contrib/rstudioapi_0.10.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 \
  
positive.code:    askpass_1.1.tar.gz \
     openssl_1.2.2.tar.gz \
     httr_1.4.0.tar.gz \
     rstudioapi_0.10.tar.gz \
     git2r_0.25.2.tar.gz \
     devtools_2.0.1.tar.gz \
     brew_1.0-6.tar.gz \
  
negative.code:    RCurl_1.95-4.12.tar.gz \
     plyr_1.8.4.tar.gz \
     httr_1.4.0.tar.gz \
     sys_3.1.tar.gz \
     askpass_1.1.tar.gz \
     openssl_1.2.2.tar.gz \
  