Download unixODBC-2.2.11-1.i386.rpm and unixODBC-devel-2.2.11-1.i386.rpm from http://sourceforge.net/project/showfiles.php?group_id=1544. For more information about this software, go to http://www.unixodbc.org.
Install these 2 packages using the rpm command. The libraries and headers will be installed to /usr/lib and /usr/includerespectively.