Compilation problem under CentOS 6

The installation of oracle-instantclient11.2-11.2.0.3.0-1.i386.rpm put the libocci into /usr/lib/oracle/11.2/client/lib folder.
 This path add this folder in the search list.
Merge pull request #4 from fabriziopicconi/patch-2

Compilation problem under CentOS 6