undefined reference to `QwtPlot::qt_metacall(QMetaObject::Call, int, void**)'

[Mr_Grieves]

I'm struggling to get a QWT plot into my application with so little documentation -- an official intro/howto guide would be helpful. The few examples lingering around the net are from different versions that use very different syntax, etc....

Ok, /rant.

I'm trying to compile this as a generic plot of y = x^2 for the moment:
histPlot.cpp:

#include <qwt5/qwt_plot.h>
#include <qwt5/qwt_plot_curve.h>
#include "histPlot.h"
#include <QWidget>
 
HistPlot::HistPlot( QWidget *parent ) : QwtPlot( parent)
{
  // Show a title
  setTitle( "History" );
 
  // Create curves
  QwtPlotCurve * curve = new QwtPlotCurve("Curve");
 
  double x[100], y[100];
 
  for (int i = 0; i < 100; i++){
    x[i] = i;
    y[i] = i*i;
  }
 
  curve->setData(x,y,100);
  curve->attach(this);
 
  // Show the plots
  replot();
 
}

#include <qwt5/qwt_plot.h>
#include <qwt5/qwt_plot_curve.h>
#include "histPlot.h"
#include <QWidget>

HistPlot::HistPlot( QWidget *parent ) : QwtPlot( parent)
{
  // Show a title
  setTitle( "History" );

  // Create curves
  QwtPlotCurve * curve = new QwtPlotCurve("Curve");

  double x[100], y[100];

  for (int i = 0; i < 100; i++){
    x[i] = i;
    y[i] = i*i;
  }

  curve->setData(x,y,100);
  curve->attach(this);

  // Show the plots
  replot();

}

To copy to clipboard, switch view to plain text mode 

But I get this from the compiler:

g++ -o timeClock dialogs.o fileOps.o frame.o histPlot.o main.o mainWindow.o timeFunctions.o timeSheet.o moc_frame.o moc_histPlot.o moc_mainWindow.o -L/usr/lib64/qt4 -lqwt -lQtGui -L/usr/lib64 -L/usr/lib64/qt4 -L/usr/X11R6/lib64 -lpng -lSM -lICE -lXi -lXrender -lXrandr -lXinerama -lfreetype -lfontconfig -lXext -lX11 -lQtCore -lz -lm -lrt -ldl -lpthread
moc_histPlot.o: In function `HistPlot::qt_metacall(QMetaObject::Call, int, void**)':
moc_histPlot.cpp:(.text+0x11): undefined reference to `QwtPlot::qt_metacall(QMetaObject::Call, int, void**)'
moc_histPlot.o: In function `HistPlot::qt_metacast(char const*)':
moc_histPlot.cpp:(.text+0x58): undefined reference to `QwtPlot::qt_metacast(char const*)'
moc_histPlot.o:(.rodata+0x0): undefined reference to `QwtPlot::staticMetaObject'
collect2: ld returned 1 exit status
make: *** [timeClock] Error 1

Neither I nor google have any idea what qt_metacall is, nor why it can't be found. Any ideas?