[Feature request] Provide a way to bypass pkg-config's logic by providing minimal info via env about pkg-config-rs HOT 5 OPEN

fn main() {
    let lib = pkg_config::Config::new()
        .probe("smbclient")
        .expect("libsmbclient not found");

    // bindgen staff
    let header = find_header(&lib).unwrap().to_str().unwrap().to_string();
    let bindings = bindgen::Builer::default().header(header)
        // bindgen config
        .generate()
        .expect("failed to generate bindings");
    // write bindings to file
}

fn main() {
    let inc_path_name = "SMBCLIENT_INCLUDE_PATH";
    let lib_path_name = "SMBCLIENT_LIBRARY_PATH";
    let header = match (env::var(inc_path_name), env::var(lib_path_name)) {
        (Ok(inc_path), Ok(lib_path)) => {
            println!("cargo:rustc-link-lib=smbclient");
            println!("cargo:rustc-link-search=native={}", lib_path);
            let mut path = PathBuf::from(inc_path);
            path.push("libsmbclient.h");
            path.to_str().unwrap().to_string()
        }
        (Ok(_), Err(_)) | (Err(_), Ok(_)) =>
            panic!("Either both {} and {} should be set or none of them", inc_path_name, lib_path_name),
        (Err(_), Err(_)) => {
            let lib = pkg_config::Config::new()
                .probe("smbclient")
                .expect("libsmbclient not found");
            find_header(&lib).unwrap().to_str().unwrap().to_string()
        }
    };

    // bindgen staff
    let bindings = bindgen::Builer::default().header(header)
        // bindgen config
        .generate()
        .expect("failed to generate bindings");
    // write bindings to file
}