cpal 0.14.2

Low-level cross-platform audio I/O library in pure Rust.
Documentation 
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use std::env;

const CPAL_ASIO_DIR: &str = "CPAL_ASIO_DIR";

fn main() {
    // If ASIO directory isn't set silently return early
    // otherwise set the asio config flag
    match env::var(CPAL_ASIO_DIR) {
        Err(_) => {}
        Ok(_) => println!("cargo:rustc-cfg=asio"),
    };
}