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use std::env; const LIB_FILE: &str = "src/externs/libwait_for_process.c"; fn main() { if env::var_os("CARGO_CFG_UNIX").is_some() { println!("cargo:rerun-if-changed={}", LIB_FILE); cc::Build::new().file(LIB_FILE).compile("wait_for_process"); } }