Installing (or using?) Qwt without compiling the Qt Creator

[r2com]

Is there any way for me to use the Qwt without compiling the Qt Creator?

And by the way my Qt Creator is: Based on Qt 5.7.0 (MSVC 2013, 32 bit)

And even if I still must build Qwt in order to use it, can it be done by building it from Qt Creator itself?

Again, all I want is to be able to generate plots inside my program, if I do not get those drag/drop Qwt controls (which I do not need anyway) I am perfectly fine with it.
I just need to be able to call Qwt functions to plot data inside my window widgets (and also plot using OpenGL)

I even tried this, I extracted the qwt-6.1.3 folder, and opened its .pro file with my Qt Creator, built it. then created a simple gui project in QtCreator, and:

.pro file:

#-------------------------------------------------
#
# Project created by QtCreator 2016-08-09T16:55:09
#
#-------------------------------------------------
 
QT       += core gui
CONFIG += qwt
QWT_LOCATION = C:\Qwt-6.1.3
INCLUDEPATH += $${QWT_LOCATION}/src
LIBS = -L$${QWT_LOCATION}/lib \
-lqwt
 
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = QwtTest2
TEMPLATE = app
 
 
SOURCES += main.cpp
 
HEADERS  +=
 
FORMS    +=

#-------------------------------------------------
#
# Project created by QtCreator 2016-08-09T16:55:09
#
#-------------------------------------------------

QT       += core gui
CONFIG += qwt
QWT_LOCATION = C:\Qwt-6.1.3
INCLUDEPATH += $${QWT_LOCATION}/src
LIBS = -L$${QWT_LOCATION}/lib \
-lqwt


greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QwtTest2
TEMPLATE = app


SOURCES += main.cpp

HEADERS  +=

FORMS    +=

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And here is the main.cpp (some code I took as example from some of the threads in here)

#include <qapplication.h>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <qwt_plot_grid.h>
#include <qwt_symbol.h>
#include <qwt_legend.h>
 
int main( int argc, char **argv )
{
    QApplication a( argc, argv );
 
    QwtPlot plot;
    plot.setTitle( "Plot Demo" );
    plot.setCanvasBackground( Qt::white );
    plot.setAxisScale( QwtPlot::yLeft, 0.0, 10.0 );
    plot.insertLegend( new QwtLegend() );
 
    QwtPlotGrid *grid = new QwtPlotGrid();
    grid->attach( &plot );
 
    QwtPlotCurve *curve = new QwtPlotCurve();
    curve->setTitle( "Some Points" );
    curve->setPen( Qt::blue, 4 ),
    curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );
 
    QwtSymbol *symbol = new QwtSymbol( QwtSymbol::Ellipse,
        QBrush( Qt::yellow ), QPen( Qt::red, 2 ), QSize( 8, 8 ) );
    curve->setSymbol( symbol );
 
    QPolygonF points;
    points << QPointF( 0.0, 4.4 ) << QPointF( 1.0, 3.0 )
        << QPointF( 2.0, 4.5 ) << QPointF( 3.0, 6.8 )
        << QPointF( 4.0, 7.9 ) << QPointF( 5.0, 7.1 );
    curve->setSamples( points );
 
    curve->attach( &plot );
 
    plot.resize( 600, 400 );
    plot.show();
 
    return a.exec();
}

#include <qapplication.h>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <qwt_plot_grid.h>
#include <qwt_symbol.h>
#include <qwt_legend.h>

int main( int argc, char **argv )
{
    QApplication a( argc, argv );

    QwtPlot plot;
    plot.setTitle( "Plot Demo" );
    plot.setCanvasBackground( Qt::white );
    plot.setAxisScale( QwtPlot::yLeft, 0.0, 10.0 );
    plot.insertLegend( new QwtLegend() );

    QwtPlotGrid *grid = new QwtPlotGrid();
    grid->attach( &plot );

    QwtPlotCurve *curve = new QwtPlotCurve();
    curve->setTitle( "Some Points" );
    curve->setPen( Qt::blue, 4 ),
    curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );

    QwtSymbol *symbol = new QwtSymbol( QwtSymbol::Ellipse,
        QBrush( Qt::yellow ), QPen( Qt::red, 2 ), QSize( 8, 8 ) );
    curve->setSymbol( symbol );

    QPolygonF points;
    points << QPointF( 0.0, 4.4 ) << QPointF( 1.0, 3.0 )
        << QPointF( 2.0, 4.5 ) << QPointF( 3.0, 6.8 )
        << QPointF( 4.0, 7.9 ) << QPointF( 5.0, 7.1 );
    curve->setSamples( points );

    curve->attach( &plot );

    plot.resize( 600, 400 );
    plot.show();

    return a.exec();
}

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It compiles without error, but when I run it it shows this in Application Output:

QWidget: Must construct a QApplication before a QWidget

ANy ideas how can I get it to work?