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Used Ubuntu on Windows and followed these steps:
1) Installed littler sudo apt-get install littler
2) Installed other dependences (libcurl) that are needed to install devtools package sudo apt-get update sudo apt-get install libcurl4-gnutls-dev librtmp-dev
3) Opened R by typing 'R' and installed needed packages install.packages("devtools") install.packages("testthat")
Note: packages are installed in user location: ~/R/x86_64-pc-linux-gnu-library/3.4
4) Installed my envnames package by going to the location of the tar.gz file (which in principle should be renamed to "envnames.tar.gz" from e.g. "envnames-0.3.1.tar.gz"(?)) cd /mnt/e/Daniel/Projects/R/packages R CMD INSTALL envnames
Note: package installed to the same user location indicated above.
5) Tested the package by running from the prompt (TO VERIFY AS I HAD NOT RECORDED THIS STEP SOON AFTER I RAN IT) R CMD CHECK envnames
Ref: http://kbroman.org/pkg_primer/pages/build.html
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