* Installing *source* package 'ROracle' ...
creating cache ./config.cache
checking how to run the C preprocessor... cc -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

ERROR: configuration failed for package 'ROracle'