Revision control
++ QT += widgets
++ requires(qtConfig(treewidget))
++
++ HEADERS = regularexpressiondialog.h
++ SOURCES = regularexpressiondialog.cpp \
++ main.cpp
++
++ RESOURCES += regularexpression.qrc
++
++ # install
++ target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/regularexpression
++ INSTALLS += target