fn main() { // Force the `std` feature in some cases let target_arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default(); let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default(); if target_arch == "wasm32" || target_os == "hermit" { println!("cargo:rustc-cfg=feature=\"std\""); } }