debug/qplotaxis.o: In function `QPlotAxis':
M:\Development\x64\QtPlot/qplotaxis.cpp:26: undefined reference to `vtable for QPlotAxis'
M:\Development\x64\QtPlot/qplotaxis.cpp:26: undefined reference to `vtable for QPlotAxis'
collect2: ld returned 1 exit status
gmake[1]: *** [debug\QtPlot.exe] Error 1
gmake: *** [debug] Error 2