why changing QCheckBox's text color doesn't work?

I am trying to change the text color of the QCheckBox and surprisingly, nothing happens. I tried it like this first:

Code:

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chk_attachments.setStyleSheet("QCheckBox { color : #767676 }");

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and like this:

Code:

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QPalette p;
    chk_attachments.setText("Attachments");
    p=chk_attachments.palette();
    p.setColor(QPalette::Text, Qt::red);
    chk_attachments.setPalette(p);

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why my attempts are ignored by QT?

Code:

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#include <QApplication>
#include <QWidget>
#include <QCheckBox>
#include <QVBoxLayout>
 
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
 
 
    QCheckBox *c1 = new QCheckBox("Default colouring");
    c1->setCheckState(Qt::Checked);
 
    QCheckBox *c2 = new QCheckBox("Should be grey");
    c2->setStyleSheet("QCheckBox { color : #767676 }");
    c2->setCheckState(Qt::Checked);
 
    QCheckBox *c3 = new QCheckBox("Should be red");
    QPalette p = c3->palette();
    p.setColor(QPalette::WindowText, Qt::red);
    c3->setPalette(p);
    c3->setCheckState(Qt::Checked);
 
    QWidget w;
    QVBoxLayout *l = new QVBoxLayout(&w);
    l->addWidget(c1);
    l->addWidget(c2);
    l->addWidget(c3);
    w.setLayout(l);
    w.show();
    return app.exec();
}

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The code above works just fine on my Linux Qt4 and Qt5.
The stylesheet approach also colours the indicator, so you probably need to also style QCheckBox::indicator.
The palette approach requires the WindowText property.

Well, your code does not work in my QT installation. (version 5.5, built on August 18)
I see all the text of the checkboxes in black.

Weird stuff
.
Thank you for the reply, I now know this is not the problem of my coding.