[dev] frr compiling with ospf support encountered a problem

Hi. ّ I can't compile the frr service on freebsd 12.1. My frr version is 1.1. I would like enable ospfd on frr, Therefore, I added --enable-ospfd on Makefile.onestep. I get the following error when compiling the frr source code: ospfd/ospf_neighbor.c: In function 'ospf_nbr_lookup': ospfd/ospf_neighbor.c:410:45: error: taking address of packed member of 'struct ip' may result in an unaligned pointer value [-Werror=address-of-packed-member] 410 | return (ospf_nbr_lookup_by_addr(oi->nbrs, &iph->ip_src)); I searched a lot of, but found nothing. Thank you for wasting time to help me.