c++ - Segfault when adding QwtPlot to the code -

i try use qwtplot, when add line mainwindow.cpp

qwtplot *plot = new qwtplot(qwttext("demo"), this); 

the application compile , link without errors, when try run get

program received signal sigsegv, segmentation fault. 0x00007ffff514227c in ?? () /usr/lib/libqtgui.so.4 

without backtrace. .pro file:

includepath += /usr/include/qwt config += qwt libs += -lqwt 

i'm using qwt 6.0.2, qt creator 2.7.0 , have qt 4.8.4 , 5.0.2 installed.

the error occours when create "qt gui application" (without .ui file) , code:

qwt-test.pro

qt       += core gui  greaterthan(qt_major_version, 4): qt += widgets  target = qwt-test template = app  includepath += /usr/include/qwt config += qwt libs += -lqwt  sources += main.cpp\         mainwindow.cpp  headers  += mainwindow.hpp 

main.cpp

#include "mainwindow.hpp" #include <qapplication> #include <qdebug>  int main(int argc, char *argv[]) {     qdebug() << "main";     qapplication a(argc, argv);     mainwindow w;     w.show();      return a.exec(); } 

mainwindow.hpp

#ifndef mainwindow_hpp #define mainwindow_hpp  #include <qmainwindow>  class mainwindow : public qmainwindow {     q_object  public:     mainwindow(qwidget *parent = 0);     ~mainwindow(); };  #endif // mainwindow_hpp 

mainwindow.cpp

// mainwindow.cpp #include "mainwindow.hpp"  #include <qwt_plot.h>  mainwindow::mainwindow(qwidget *parent)     : qmainwindow(parent) {     qwtplot *plot = new qwtplot(qwttext("demo"), this); }  mainwindow::~mainwindow() { } 

thanks!

it problem qt creator (or qwt being incompatible qt 5), recognized qmake qmake qt 4 qt 5. fixing versions in options -> build&run -> qt versions , using qt 4 project fixed segfault.