fn main() { let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default(); let target_arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default(); if target_os == "windows" && (target_arch == "x86" || target_arch == "x86_64") { thunk::thunk(); } }