so shared library problem

[mtrpoland]

Guys, quite newbie stuff:
I have a .so shared library with my brand new InfoBox widget placed in a MTR namespace.
Then I have a test program:

#include <QApplication>
#include <QtCore>
#include <QtGui>
 
int main(int argc, char* argv[]) {
	QApplication app(argc, argv);
	MTR::InfoBox ib;
	ib.show();
	app.exec();
	return 0;
}

#include <QApplication>
#include <QtCore>
#include <QtGui>

int main(int argc, char* argv[]) {
	QApplication app(argc, argv);
	MTR::InfoBox ib;
	ib.show();
	app.exec();
	return 0;
}

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its .pro:

TEMPLATE = app
CONFIG += qt
LIBS += -L/home/mtr/Programowanie/Projekty/MTRInfoBox -lMTRInfoBox
SOURCES += main.cpp

TEMPLATE = app
CONFIG += qt
LIBS += -L/home/mtr/Programowanie/Projekty/MTRInfoBox -lMTRInfoBox
SOURCES += main.cpp

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as you see I link the directory of my .so file as well as its name without "lib" prefix and .so* suffix.

I do not receive any messages that libMTRInfoBox.so.1.0.1 file hasn't been found.

Anyway I receive a message as if my test program did not know MTR::InfoBox class. Furthermore it doesn't recognize MTR namespace.

All in all I must have made some mistake somewhere...