Internal error: global void variable

This program generates an internal error. Note void global variable and incorrect syntax for draw_greenSquare function definition.

``` C
#include <stdio.h>
#include <draw.h>

void draw_green;

int main(int argc, char * argv[])
{     
    draw_greenSquare();
    return 0;
}

void draw_greenSquare
{
}
```
