Problems setting up GLFW on Arch Linux - c++

Question

I use Linux, more specifically, Arch Linux. I wanted to work with OpenGL, so I did the following steps:
First, I downloaded the glfw-x11 with the pacman package manager.
I also used cmake to add glfw to /usr/local/include, everything works fine.
I wrote a Makefile to run my program with the command:
gcc -o demo main.c -lglfw3 -lm -lXrandr -lXi -lXxf86vm -lpthread
Also note that I removed -lGl because gcc, the compiler, screamed at me.
Here is my project directory: glad main.c Makefile. Note that glad is a directory. And it works fine.
I am running on Linux so I can't install Visual Studio and I am really don't think I need CodeBlocks to create an OpenGL project.
The error the compiler gives me when I run this code (in main.c):
#include <stdio.h>
#include "glad/glad.h"
#include <GLFW/glfw3.h>
int main() {
glfwInit();
printf("Hello, OpenGL!");
// Code goes here..
glfwTerminate();
return 0;
}
The compiler gave me:
/usr/bin/ld: /usr/local/lib/libglfw3.a(x11_window.c.o): undefined reference to symbol 'XPending'
/usr/bin/ld: /usr/lib/libX11.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Edit
lGL just worked, but still I get the same error.
Another Edit
Adding -ldl, lXinerama and lXcursor worked for me.
Final Edit
I fixed it, first, you create a main.cpp (or whatever you wanna call it). Make sure you have libgl, glu and glfw-x11 installed. Then create a Makefile with the flags -lGL -lGLU -lglfw3 -lm -lXrandr -lXi -lX11 -lXxf86vm -lpthread -ldl -lXinerama -lXcursor. Then download glad. Extract glad.zip (Make sure glad is in the project folder). Move src/glad.c into the project directory. Include glad with "include/glad/glad.h" or whatever directory you choose. Also make sure GLFW is in /usr/local/bin.