debug/mainwindow.o: In function `ZN10MainWindowD0Ev':D:/Qt_projects/GraphTest/mainwindow.cpp:13: undefined reference to `GraphWidget::GraphWidget(QWidget*)'
QT += openglCONFIG += designer \ pluginTARGET = $$qtLibraryTarget($$TARGET)TEMPLATE = libQTDIR_build:DESTDIR = $$QT_BUILD_TREE/plugins/designerHEADERS += ../ui_graphwidget.h \ ../SinFunctor.h \ ../HorizontalLineBar.h \ ../graphwidget.h \ ../GraphView.h \ ../GraphItem.h \ ../VerticalLineBar.h \ GraphWidgetInterface.hSOURCES += ../VerticalLineBar.cpp \ ../HorizontalLineBar.cpp \ ../graphwidget.cpp \ ../GraphView.cpp \ ../GraphItem.cpp \ GraphWidgetInterface.cpp# installtarget.path = $$[QT_INSTALL_PLUGINS]/designersources.files = $$SOURCES \ $$HEADERS \ *.prosources.path = $$[QT_INSTALL_EXAMPLES]/designer/customwidgetpluginINSTALLS += target \ sources