Create OS X graphic executable with ocamlc

Learning
1

Hello

I’d like to know the syntaxe for Mac to create executable with graphics

I have the graphic window with

$ utop
#require "graphics" ;;
Graphics.open_graph "";;

but with compile syntaxe like

% ocamlc graphics.cma test_graph.ml

I get

**File "test_graph.ml", line 18, characters 0-19** :
18 | Graphics.open_graph "";;

**^^^^^^^^^^^^^^^^^^^**

**Error** : Unbound module Graphics

How to do ?

The program is

Graphics.open_graph "";;