libxm 1.1.0

A binding of libxm for Rust. A small XM (FastTracker II Extended Module) player library. Designed for easy integration in demos and such, and provides timing functions for easy sync against specific instruments, samples or channels.
Documentation 
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use cc;

fn main() {
    fn parse_env(key: &str, default: bool) -> bool {
        use std::env::{var, VarError};

        match var(key) {
            Ok(val) => {
                match &val as &str {
                    "0" => false,
                    "1" => true,
                    _ => default
                }
            },
            Err(VarError::NotPresent) => default,
            Err(VarError::NotUnicode(_)) => panic!("Environment variable is not unicode: {}", key),
        }
    }

    let defensive = parse_env("XM_DEFENSIVE", true);
    let strings = parse_env("XM_STRINGS", true);
    let libxmize_delta_samples = parse_env("XM_LIBXMIZE_DELTA_SAMPLES", true);
    let linear_interpolation = parse_env("XM_LINEAR_INTERPOLATION", true);
    let ramping = parse_env("XM_RAMPING", true);
    let debug = parse_env("XM_DEBUG", false);
    let big_endian = parse_env("XM_BIG_ENDIAN", false);

    fn on_off(value: bool) -> Option<&'static str> {
        Some(if value { "1" } else { "0" })
    }

    cc::Build::new()
        .file("libxm/src/context.c")
        .file("libxm/src/load.c")
        .file("libxm/src/play.c")
        .file("libxm/src/xm.c")
        .include("libxm/include")
        .define("XM_DEFENSIVE", on_off(defensive))
        .define("XM_STRINGS", on_off(strings))
        .define("XM_LIBXMIZE_DELTA_SAMPLES", on_off(libxmize_delta_samples))
        .define("XM_LINEAR_INTERPOLATION", on_off(linear_interpolation))
        .define("XM_RAMPING", on_off(ramping))
        .define("XM_DEBUG", on_off(debug))
        .define("XM_BIG_ENDIAN", on_off(big_endian))
        .flag("--std=c11")
        .compile("libxm.a");
}