Building simple iOS app on OSX

Hello,

I'm trying to build this very simple app after compiling goios:

package main

import (
    "log"
    "golang.org/x/mobile/app"
)

func main() {
    app.Run(app.Callbacks{
        Draw: draw,
    })
}

func draw() {
    log.Print("In draw loop, can call OpenGL.")
}

In the goios/bin folder, I placed the main.go file. I have the golang.org/x/mobile/app package in my $GOPATH and I run:

$ CGO_ENABLED=1 GOARCH=arm ./go build`
# golang.org/x/mobile/gl
../../../go/src/golang.org/x/mobile/gl/gl.go:29:10: fatal error: 'OpenGL/gl3.h' file not found
#include <OpenGL/gl3.h>
         ^
1 error generated.

.. what am I doing wrong here..? the OpenGL headers are in /System/Library/Frameworks/OpenGL.framework/

it would be great to have a note about how to get a simple example running with goios. And also, thank you for this work! I'm very excited to see it prosper!

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