:-/ R

Arrrrr

Step 20 : RUN echo "library(devtools); install_github('jimhester/robustr')" | R --no-save
 ---> Running in 0dad537b2da8

R version 3.1.3 (2015-03-09) -- "Smooth Sidewalk"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-unknown-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(devtools); install_github('jimhester/robustr')
Downloading github repo jimhester/robustr@master
Error in function (type, msg, asError = TRUE)  :
  error setting certificate verify locations:
  CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
Calls: install_github ... perform -> <Anonymous> -> .Call -> <Anonymous> -> fun
Execution halted