Installing ragg (needed by devtools)

• If using gcc/10.2.0

wget https://cran.r-project.org/src/contrib/Archive/ragg/ragg_1.2.5.tar.gz

tar xvf ragg_1.2.5.tar.gz

R CMD INSTALL ragg

• if using gcc/11.3.0

wget https://cran.r-project.org/src/contrib/Archive/ragg/ragg_1.3.3.tar.gz
tar xvf ragg_1.3.3.tar.gz 
R CMD INSTALL ragg