Throughout this book, the environment variable CLFS will be used several times. It is paramount that
this variable is always defined. It should be set to the mount point
chosen for the CLFS partition. Check that the CLFS variable is set up properly with:
echo ${CLFS}
Make sure the output shows the path to the CLFS partition's mount
point, which is /mnt/clfs if the
provided example was followed. If the output is incorrect, the
variable can be set with:
export CLFS=/mnt/clfs
Having this variable set is beneficial in that commands such as install -d ${CLFS}/tools can be typed literally. The shell will automatically replace “${CLFS}” with “/mnt/clfs” (or whatever the variable was set to) when it processes the command line.
Do not forget to check that ${CLFS} is set
whenever you leave and reenter the current working environment (as
when doing a “su” to
root or another user).