use std::env::var_os; const URL: &str = "https://github.com/sandialabs/sandiadecay/raw/cd75314b56e12b80497531a1fbeed9c8e9968403/sandia.decay.xml"; fn main() { println!("cargo::rustc-check-cfg=cfg(docsrs)"); if var_os("DOCS_RS").is_some() { println!("cargo::rustc-cfg=docsrs"); } else { sandia_decay_database_common::download(URL); } }