ggplot2 env

apt-get update
apt-get install -y libproj-dev libgdal-dev
apt-get clean

# install 'ggalt' pkg
install.packages("proj4")
devtools::install_github("hrbrmstr/ggalt")
install.packages("cowplot")  # a gganimate dependency
install.packages("gganimate")
install.packages("gapminder")
install.packages("ggExtra")