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extern crate gl_generator;    // <-- this is your build dependency
extern crate khronos_api;    // included by gl_generator

use std::os;
use std::io::File;

fn main() {
let dest = Path::new(os::getenv("OUT_DIR").unwrap());

let mut file = File::create(&dest.join("gl_bindings.rs")).unwrap();

// This generates bindsings for OpenGL ES v3.1
gl_generator::generate_bindings(gl_generator::GlobalGenerator,
                                gl_generator::registry::Ns::Gles2,
                                khronos_api::GL_XML,
                                vec![],
                                "3.1", "core", &mut file).unwrap();
}