The files qt_example.cpp, qt_PlotWindow.cpp, and qt_PlotWindow.h contain
source code for a simple example demonstrating how to access the PLplot API
from a Qt GUI application.

For all our build systems (cmake in the build tree, cmake in the
installed examples build tree, and the traditional pkg-config+Makefile
build system for the installed examples tree), you build this simple
Qt example (with all dependencies taken care of automatically) by
running

make qt_example

For our two CMake-based build systems you can run this example (with
all dependencies taken care of automatically) by running

make test_qt_example