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

 You will need the PostgreSQL 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 the PostgreSQL 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).