Freeglut error: fgInitGL2: fghGenBuffers is NULL

I'm transferring a program from OSX to Windows, but one error is still nagging me. The error occurs during run-time in gdb. Compiling and linking goes all fine.

freeglut (C:\path\to\file.exe): fgInitGL2: fghGenBuffers is NULL

Outside the GDB environment it gives an APPCRASH (windows-shell) or Segmentation fault (mingw64-shell).

My linker flags are:

-std=c++11 -lstdc++ -lz -lm -lmysqlcleint -lpthread -lboost_thread-mgw49-mt-d-1_57 -lboost_system-mgw49-mt-d-1_57 -lboost_regex-mgw49-mt-d-1_57 -lcurl -lfreeglut -lglu32 -lopengl32 -lws2_32 -lwsock32 -U__CYGWIN__

I'm working in msys2 mingw-w64. During runtime, the program tries to open a new window (at least a pictogram rices in the windows taskbar), but the construction of the window won't succeed. The program runs fine on OSX, where I use glut instead of freeglut.

Header (amongst others):

#include <direct.h>
#include <GL/glut.h>
#include <GL/freeglut.h>

CPP (amongst others):

void interface::startInterface(int &argc, char **argv){

    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize  (width, height);
    glutInitWindowPosition (1920, 0);
    glutInit            (&argc, argv);
    glutCreateWindow    ("TIFAR 2.0");


    LoadGLTextures();                           // Load The Texture(s) ( NEW )
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);       // This Will Clear The Background Color To Black
    glClearDepth(1.0);                          // Enables Clearing Of The Depth Buffer
    glDepthFunc(GL_LESS);                       // The Type Of Depth Test To Do
    glEnable(GL_DEPTH_TEST);                    // Enables Depth Testing
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glShadeModel(GL_SMOOTH);                    // Enables Smooth Color Shading
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();                           // Reset The Projection Matrix

    gluPerspective(45.0f, (GLfloat) width / (GLfloat) height, 0.1f, 100.0f);
    // Calculate The Aspect Ratio Of The Window

    glMatrixMode(GL_MODELVIEW);

    glutDisplayFunc     (interface::display);
    glutReshapeFunc     (interface::reshape);
    glutIdleFunc        (interface::idle);
    glutKeyboardFunc    (interface::processNormalKeys);

    glutMainLoop();
}

There are some other parts in the program, like where images are loaded, but I think it will be to much information when I mention everything here.

Hope you can help me further; any help will be appreciated.

~Mart