use std::io::prelude::*;
fn main() {
let mut file = std::fs::OpenOptions::new()
.append(true)
.create(true)
.open(format!("{}/vars.txt", std::env::var("OUT_DIR").unwrap()))
.unwrap();
for (key, value) in std::env::vars() {
writeln!(file, "{} = {}", key, value).unwrap();
}
}