As you said, I recompiled the source code of LimeReport on the platform I'm working on, I got the dlls and headers and that problem had disappeared

Many thanks, to open my eyes.

Pablo

But is quite curious, because I take the demos of LimeReport and compile perfectly. Okay, that project is compiling all sources.

In my little application I'm using LimeReport binaries, using their libraries and headers.
Probably there some error, I don´t know

Which platform are you building on ?

Also, did you re-run qmake after adding LimeReport ?

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
report = new LimeReport::ReportEngine(this);
}

MainWindow::~MainWindow()
{
delete ui;
}
MIANWINDOW.H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "lrreportengine.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;
LimeReport::ReportEngine *report;

};

#endif // MAINWINDOW_H

PRO File

QT += core gui uitools script xml sql printsupport

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = UsandoLimeReport
TEMPLATE = app

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

LIBS += -L"/LimeReport/lib" -llimereport
INCLUDEPATH += "/LimeReport/include"

What does your MainWindow look like ?