I know this is very old, but I ran into the same problem and could not find a solution online, so I'm hopefully going to save someone else the trouble in the future.
The problem is that you are...
Unfortunately i need to build PyQt5 from source code because i was instructed to do it in that way at work.
After a couple days trying i was able to build PyQt5 but in order for PyQt5 to compile i...
Maybe using ldd to find out what libraries/dependencies your application has ?
HTH,
Uwe
Yes, but just before instantiating qwt the qApp pointer appears to be OK:
qDebug() << qApp; // Check
QApplication(0x7ffde3f14770) // Prints out
So it is definitely Qwt that's...
The warning is coming from the constructor of QWidget - what is a base class of QwtPlot - not from Qwt code.
For some reason the qApp pointer is broken - at least this is the check, that leads to...
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