Create an RViz dockable panel w/ catkin and Qt5

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Hi everyone,

These past days, I'm trying to write an RViz dockable panel following the tutorial here.
My goal is basically to display – for now – an empty panel (the strict minimum, for a beginning).
The problem is that all the tutorial is writing with both rosbuild and Qt4, while I would like to use catkin and Qt5. Each time I'm trying to compile, I keep having this error message :

[ERROR] [1426085794.672184440]: PluginlibFactory: The plugin for class 'plugin_panel/Hi' failed to load.  Error: Failed to load library /home/mdufour/catkin_ws_test/devel/lib/libplugin_panel.so. Make sure that you are calling the PLUGINLIB_EXPORT_CLASS macro in the library code, and that names are consistent between this macro and your XML. Error string: Could not load library (Poco exception = /home/mdufour/catkin_ws_test/devel/lib/libplugin_panel.so: undefined symbol: _ZTVN8my_panel11PluginPanelE)

My package directory looks like this :

plugin_panel/
|__ CMakeLists.txt
|__ package.xml
|__ plugin_description.xml
|__ src/
    |__ plugin_panel.cpp

All the code is in the .cpp file, for simplification.
Here's my CMakeLists.txt :

cmake_minimum_required(VERSION 2.8.11)

project(plugin_panel)

find_package(Qt4 REQUIRED)
find_package(catkin REQUIRED)

include(${QT_USE_FILE})
add_definitions(${QT_DEFINITIONS})

add_library(${PROJECT_NAME} src/plugin_panel.cpp)

target_link_libraries(${PROJECT_NAME} ${QT_LIBRARIES} ${catkin_LIBRARIES})

This is my .cpp (very basic!) :

#include <QWidget>
#include <QHBoxLayout>
#include <QLabel>

#include <rviz/panel.h>

namespace my_panel
{
    class PluginPanel: public rviz::Panel
    {
        Q_OBJECT

    public:
        PluginPanel(QWidget* parent = 0):
            rviz::Panel(parent)
            {
                QHBoxLayout* topic_layout = new QHBoxLayout;
                topic_layout->addWidget(new QLabel("Hi!"));
            }
    };
}

#include <pluginlib/class_list_macros.h>
PLUGINLIB_EXPORT_CLASS(my_panel::PluginPanel, rviz::Panel)

The package.xml (overloaded for sure) :

<?xml version="1.0"?>
<package>
    <name>plugin_panel</name>

    <version>0.0.0</version>

    <description>
        An additional (yet empty) panel in RViz.
    </description>

    <maintainer email="none@none.none">Matthieu</maintainer>

    <license>BSD</license>

    <buildtool_depend>catkin</buildtool_depend>

    <build_depend>roscpp</build_depend>
    <build_depend>roslib</build_depend>
    <build_depend>rviz</build_depend>
    <build_depend>pluginlib</build_depend>
    <build_depend>class_loader</build_depend>

    <run_depend>roscpp</run_depend>
    <run_depend>roslib</run_depend>
    <run_depend>rviz</run_depend>
    <run_depend>pluginlib</run_depend>
    <run_depend>class_loader</run_depend>

    <export>
        <rviz plugin="${prefix}/plugin_description.xml"/>
    </export>
<package>

And finally the plugin_description.xml :

<library path="lib/libplugin_panel">
    <class name="plugin_panel/Hi"
           type="my_panel::PluginPanel"
           base_class_type="rviz::Panel">
        <description>
            An empty panel.
        </description>
    </class>
</library>

Phew! Sorry, that was heavy…
I'm certainly missing something in one of those files, but I can't figure out what.

Thanks for your answers.