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What does * = mean in .pro file (Qt)

I am trying to build qtdemo on Windows and I almost did it, but problem with qtquick examples. I think it starts in the qtdemo.pro file, this part:

contains(QT_CONFIG, quick1) {
    QT += quick1
} else {
    DEFINES *= QT_NO_DECLARATIVE
}

It always sets QT_NO_DECLARATIVE, so the program throws an error and doesn't run this example. I searched what the "* =" operator means, but I couldn't find it anywhere. Somebody knows? They always talked about + = and - = but * = are not mentioned at all ...

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From the docs :



The * = operator adds a value to the list of values ​​in a variable, but only if it is not already present. This prevents the variable from being included many times.

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