In file included from ../../sutils/swapoff.c:2: ../../sutils/swapon.c:469:67: error: expected ';' at end of declaration error_t parse_opt (int key, char *arg, struct argp_state *state) ^ ; ../../sutils/swapon.c:523:16: error: use of undeclared identifier 'argp' argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, 0); ^ 2 errors generated.