Package ROracle build failure report

Build errors
ERROR: configuration failed for package 'ROracle'
Build output
* checking for file 'ROracle/DESCRIPTION' ... OK
* preparing 'ROracle':
* checking DESCRIPTION meta-information ... OK
* cleaning src
* checking whether 'INDEX' is up-to-date ... NO
* use '--force' to overwrite the existing 'INDEX'
* removing junk files
* checking for LF line-endings in source files
* checking for empty directories
* building binary distribution
* Installing *source* package 'ROracle' ...
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking how to run the C preprocessor... gcc -E

ROracle configuration error:

You must set the shell variable ORACLE_HOME to the
directory where Oracle resides and re-run R CMD INSTALL
e.g., (using Bourne shell syntax):

export ORACLE_HOME=/opt/oracle
R CMD INSTALL ROracle

** Removing '/private/tmp/Rinst.25876/ROracle'
ERROR
* installation failed