Cannot get GLFW3 Library working - c++

Question

I am trying to get the GLFW3 working on my workstation. I did install GLFW3 on my Ubuntu 12.04 from http://www.glfw.org/download.html
Here is the program I am trying. Got it from GLFW official site
http://www.glfw.org/documentation.html
#include <GLFW/glfw3.h>
#include <iostream>
int main(void)
{
GLFWwindow* window;
/* Initialize the library */
if (!glfwInit())
{
std::cout<< "xxx\n";
return -1;
}
/* Create a windowed mode window and its OpenGL context */
window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
if (!window)
{
std::cout<< "yyy\n";
glfwTerminate();
return -1;
}
/* Make the window's context current */
glfwMakeContextCurrent(window);
/* Loop until the user closes the window */
while (!glfwWindowShouldClose(window))
{
/* Render here */
/* Swap front and back buffers */
glfwSwapBuffers(window);
/* Poll for and process events */
glfwPollEvents();
}
glfwTerminate();
return 0;
}
Followed this stackoverflow question How to build & install GLFW 3 and use it in a Linux project
compiled it as -
g++ -I/usr/local/include glfw.cpp -L/usr/local/lib -lGL -lGLU -lglfw3 -lX11 -lXxf86vm -lXrandr -lpthread -lXi -lrt
It could successfully compile. However when I launch the executable, I it prints
yyy
Which means the window was not created. What could have been wrong, how can I fix it?