Today I discovered that I couldn't include the QDebug header file at the time I need it.
When I write in C/C++ I like to add my test libraries at the point where I'm writing the debug function I'm working on so that way I can delete it all at once.
So the skeleton of a file would look something like this:
Comment (copyright/purpose of file)
#include of all headers necessary
#include of debug headers
However, today I had problems compiling and/or linking doing so. The qDebug() << ... expressions did not want to work.
Moving the #include of debug headers to