QtE56: QFormBuilder: Error: undefined identifier `QFormBuilder`

[Marcone]

On Thursday, 28 April 2022 at 06:58:12 UTC, MGW wrote:
> On Thursday, 28 April 2022 at 01:25:57 UTC, Marcone wrote:
>> I'm trying to load a .ui GUI designed in Qt Designer. I'm 
>> following the examples in the links below, but the following 
>> error occurs: Error: undefined identifier QFormBuilder
>
>
> Probably did not compile
> QtE5-master/build/QtE56/qte56core.pro
> QtE5-master/build/QtE56/qte56widgets.pro
> Use QMAKE to build a DLL/SO
>
> More details by mail: mgw at yandex.ru

Now is working very well. But, how can I reference a widget using 
.ui?

connects("MyButton", "clicked()", botao_acao, "Slot_AN()");

How can I reference "MyButton"????