IXFR_SIZE_DEFAULT
uint64_t ixfr_size = IXFR_SIZE_DEFAULT;
fprintf(stderr, "\t-s <ixfr size>\tsize of IXFR to store, at most. default %d.\n", (int)IXFR_SIZE_DEFAULT);
p->ixfr_size = IXFR_SIZE_DEFAULT;