Revision control
++ RESOURCES += images.qrc
++
++ HEADERS += mainwindow.h view.h chip.h
++ SOURCES += main.cpp
++ SOURCES += mainwindow.cpp view.cpp chip.cpp
++
++ QT += widgets
++ qtHaveModule(printsupport): QT += printsupport
++
++ build_all:!build_pass {
++ CONFIG -= build_all
++ CONFIG += release
++ }
++
++ # install
++ target.path = $$[QT_INSTALL_EXAMPLES]/widgets/graphicsview/chip
++ INSTALLS += target
++