in optee-teec/optee-teec-sys/build.rs [21:26]
fn main() {
let optee_client_dir = env::var("OPTEE_CLIENT_DIR").unwrap_or("../../optee/optee_client/out".to_string());
let search_path = Path::new(&optee_client_dir).join("libteec");
println!("cargo:rustc-link-search={}", search_path.display());
println!("cargo:rustc-link-lib=dylib=teec");
}