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I am trying to build the code on ubuntu using Qt5.13.0 in combination with gcc-9 and g++-9.
All compiles well except line 119 in image_histogram_widget.cpp

I get the error: no matching function for call to ‘reduce(QVector::const_iterator, QVector::const_iterator)'

Code on line 119 | int sum = std::reduce(histogram.constBegin(), histogram.constEnd());

std::reduce takes a minimum of 3 arguments, you are just providing 2

Can you please help resolving this issue.