46a18d17_ation___11g_Release_5__11_1_5___Screen
If this is your first Oracle installation on this host, you must specify the location of the Central Inventory Directory. It is used by the installer to keep track of all Oracle products installed on this host. The default location for this file varies by platform. In the Operating System Group Name field, select the group whose members will be granted access to the inventory directory. All members of this group can install products on this host. Click OK to continue. The Inventory Location Confirmation dialog prompts you to run the inventory_directory/createCentralInventory.sh script as root to create the /etc/oraInst.loc file. This file is a pointer to the central inventory and must be present for silent installations. It contains two lines: inventory_loc=path_to_central_inventory inst_group=install_group The standard location for this file is /etc/oraInst.loc, but it can be created anywhere. Note that the default for Linux and AIX platforms is /etc/oraInst.loc and for Solaris and HP, it is /var/opt/oracle/oraInst.loc. If you create it in a directory other than /etc, you must include the -invPtrLoc argument and enter the location of the inventory when you run the provisioningWizard or the runProvisioning script. If you do not have root access on this host but want to continue with the installation, select Continue installation with local inventory. Click OK to continue. [Screen] 
Specify Inventory Directory (UNIX)
Preparing for an Installation - 11g Release 5 (11.1.5)