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

 You will need ODBC development headers and libraries installed before
 compiling this plugin.

 See the Qt SQL documentation for more information on compiling Qt SQL
 driver plugins (sql-driver.html).
	You will need ODBC development headers and libraries installed before
	compiling this plugin.

	See the Qt SQL documentation for more information on compiling Qt SQL
	driver plugins (sql-driver.html).