plugin.pro Example File
tools/echoplugin/plugin/plugin.pro
TEMPLATE = lib
CONFIG += plugin
QT += widgets
INCLUDEPATH += ../echowindow
HEADERS = echoplugin.h
SOURCES = echoplugin.cpp
TARGET = $$qtLibraryTarget(echoplugin)
DESTDIR = ../plugins
EXAMPLE_FILES = echoplugin.json
# install
target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/echoplugin/plugins
INSTALLS += target
CONFIG += install_ok # Do not cargo-cult this!