Mac-4.7.4/src/plugins/sqldrivers/README - platform/external/qt - Git at Google

 Please note that the DB2, Oracle and TDS client drivers are not distributed
 with the Qt Open Source Editions.

 This is because the client libraries are distributed under a license which
 is not compatible with the GPL license.
	Please note that the DB2, Oracle and TDS client drivers are not distributed
	with the Qt Open Source Editions.

	This is because the client libraries are distributed under a license which
	is not compatible with the GPL license.