glfwtest.c

// gcc -framework OpenGL -lglfw3 glfwtest.c -o glfwtest
#include <stdio.h>
#include <stdlib.h>
#include <GLFW/glfw3.h>

int main()
{
    GLFWwindow* window;

    if (!glfwInit()) {
        fprintf(stderr, "glfwInit() failed\n");
        abort();
    }

    window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
    if (!window) {
        fprintf(stderr, "glfwCreateWindow() failed\n");
        abort();
    }

    printf("GLFW_CONTEXT major=%d minor=%d\n",
            glfwGetWindowAttrib(window, GLFW_CONTEXT_VERSION_MAJOR),
            glfwGetWindowAttrib(window, GLFW_CONTEXT_VERSION_MINOR));

    return 0;
}