imu_filter_madgwick does not compile properly on Ubuntu18.04 - Melodic

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Hello, I downloaded the imu_filter_madgwick tool from here and installed on my catkin_ws. Unfortunately it does not compile and the problem is due to the file imu_filter_nodelet.cpp.

As I compile the project I receive the following error from the compiler.

`/home/emanuele/catkin_ws/src/imu_tools/imu_filter_madgwick/src/imu_filter_nodelet.cpp:39:24: error: expected constructor, destructor, or type conversion before ‘(’ token
 PLUGINLIB_DECLARE_CLASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet);`

That seems to be due to the following line PLUGINLIB_DECLARE_CLASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet); in the .cpp file below:

#include "imu_filter_madgwick/imu_filter_nodelet.h"
#include <pluginlib/class_list_macros.h>

void ImuFilterNodelet::onInit()
{
  NODELET_INFO("Initializing IMU Filter Nodelet");

  // TODO: Do we want the single threaded or multithreaded NH?
  ros::NodeHandle nh         = getMTNodeHandle();
  ros::NodeHandle nh_private = getMTPrivateNodeHandle();

  filter_.reset(new ImuFilterRos(nh, nh_private));
}

PLUGINLIB_DECLARE_CLASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet);

After doing some research I found out that the PLUGINLIB_DECLARE_CLASS... is deprecated and should be substituted with the following line: PLUGINLIB_EXPORT_CLASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet);

However as I try to compile the project I get a different compilation error which can be seen below:

`PLUGINLIB_EXPORT_CLASS" passed 4 arguments, but takes just 2
 ASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet);
                                                                              ^
/home/emanuele/catkin_ws/src/imu_tools/imu_filter_madgwick/src/imu_filter_nodelet.cpp:39:1: error: ‘PLUGINLIB_EXPORT_CLASS’ does not name a type
 PLUGINLIB_EXPORT_CLASS(imu_filter_madgwick, ImuFilterNodelet, ImuFilterNodelet, nodelet::Nodelet);`

It seems that no matter what I substitute I can't make catkin_ws to work correctly. Is there something that I am missing or can someone point in the right direction on what the problem could be?