title: Compiling a C program that uses OpenGl in Mac OS X
body: <p>I am trying to compile a C program for my CS class. I have Command Line tools installed on my Mac, so I probably have OpenGL. The program description was made for Ubuntu and it says for me to compile using:</p>
  
  <pre><code>gcc -Wall -ansi -pedantic -O2 main.o graphic.o imagem.o io.o -o ep2 -lGL -lGLU -lglut
  </code></pre>
  
  <p>I ran that and it said:</p>
  
  <pre><code>ld: library not found for -lGL
  </code></pre>
  
  <p>What flags should I use? What do I do?</p>