Environment variables problem

[yi-chia wang]

when i type in this

$ R CMD INSTALL Rhipe_0.73.1.tar.gz

the error message is

** R
** inst
** preparing package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded
Rhipe requires HADOOP_HOME or HADOOP or HADOOP_BIN environment variable to be present
 $HADOOP/bin/hadoop or $HADOOP_BIN/hadoop should exist
Rhipe: HADOOP_BIN is missing, using $HADOOP/bin
HADOOP_HOME missing
HADOOP_CONF_DIR missing, you are probably going to have a problem running RHIPE.
HADOOP_CONF_DIR should be the location of the directory that contains the configuration files
------------------------------------------------
| Please call rhinit() else RHIPE will not run |
------------------------------------------------

how can i set the hadoop  Environment variables for rhipe ?

i can't solve  this problem can anyone can help me ?????

please thx~!!