I try to install the package \"data.table\" (and \"aws.s3)\" via Rstudio Server on an Amazon Linux instance following this guide: http://stanke.co/category/r/
Unfor
I had the same issue on AWS and already fixed. You need first install gcc64 and openmp shared support library.
sudo yum install gcc64
sudo yum install libgomp
Then under your user home create an .R folder with a Makevars file in it, with the following content (it will tell to R which compiler to use):
CC = /usr/bin/gcc64
CXX = /usr/bin/g++
SHLIB_OPENMP_CFLAGS = -fopenmp
I hope it's working for you as well ...