QPSQL driver not loaded Qt

I have some trouble when I want to add a database.

    _dataBase = QSqlDatabase::addDatabase("QPSQL");

After calling this method I have an error:

QSqlDatabase: QPSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7

I include to PATH variable paths to:

PostgreSQL\9.3\bin
PostgreSQL\9.3\lib
PostgreSQL\9.3\include

Also I copy folder sqldrivers to Debug folder. Also tried to copy dlls drom this folder to Debug. Doesn't work either.

Solution

I came here googling because I had the same problem in Windows.

In my case to solve the issue I had to install PostgreSQL for Windows 32 bits since my Qt target was MinGW 32 bits.

Additionally, I had to add the PATH to the PostgreSQL bin and lib directories so Qt could find the right .dlls.

@SET PATH=C:\Program Files (x86)\PostgreSQL\9.6\bin\;C:\Program Files (x86)\PostgreSQL\9.6\lib\;%PATH%

The PATH can be set before launching Qt Creator or using the Qt Creator itself via the Build Environment in the Projects pane.