I have copied R-2.3.0.tar.gx and uncompressed the directory R-2.3.0 is created. ./configure Make Typed R in the directory /root/downloads/R-2.3.0/bin/exec -bash-2.05b# pwd /root/downloads/R-2.3.0/bin/exec -bash-2.05b# R Fatal error: R home directory is not defined