{"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
    if let Some(dirs) = option_env!("LLVM_SYS_SYSTEM_LIBRARY_DIRS") {
    // Add the directories provided through the environment variable.
        system_library_dirs.extend(dirs.split(':').map(|s| s.to_string()));