extern uint64_t thread_id ();
extern int avio_open_boost (AVIOContext** s, boost::filesystem::path file, int flags);
extern boost::filesystem::path home_directory ();
-extern std::string command_and_read (std::string cmd);
extern bool running_32_on_64 ();
extern void unprivileged ();
extern boost::filesystem::path config_path ();