int opkg_list_packages (opkg_t *opkg, opkg_package_callback_t callback, void *user_data);
int opkg_list_upgradable_packages (opkg_t *opkg, opkg_package_callback_t callback, void *user_data);
opkg_package_t* opkg_find_package (opkg_t *opkg, const char *name, const char *version, const char *architecture, const char *repository);
int opkg_list_packages (opkg_t *opkg, opkg_package_callback_t callback, void *user_data);
int opkg_list_upgradable_packages (opkg_t *opkg, opkg_package_callback_t callback, void *user_data);
opkg_package_t* opkg_find_package (opkg_t *opkg, const char *name, const char *version, const char *architecture, const char *repository);