Trying to build on FreeBSD src/rt.c:679:25: error: field has incomplete type 'struct nlmsghdr'

Hi,

EDIT:
Latest commit broke it, e1746bb

I used the previous one and it worked fine to build.

---

Trying to build ndpdd on FreeBSD, I'm using make, have tried with both clang and gcc:
lrwxr-xr-x 1 root wheel 19 Oct 5 14:09 /usr/bin/gcc -> /usr/local/bin/gcc9

I get this errors, any ideas? Thanks!

Cloning into 'ndppd'...
remote: Enumerating objects: 1258, done.
remote: Counting objects: 100% (100/100), done.
remote: Compressing objects: 100% (68/68), done.
remote: Total 1258 (delta 66), reused 61 (delta 32), pack-reused 1158
Receiving objects: 100% (1258/1258), 356.62 KiB | 2.48 MiB/s, done.
Resolving deltas: 100% (939/939), done.
root@test:~ # cd ndppd/
root@test:~/ndppd # git checkout 1.0-devel
Branch '1.0-devel' set up to track remote branch '1.0-devel' from 'origin'.
Switched to a new branch '1.0-devel'

 gmake all
cc -c  -Os -Werror -Wall -Wextra -Wno-missing-braces -Wno-missing-field-initializers -o src/rt.o src/rt.c
src/rt.c:679:25: error: field has incomplete type 'struct nlmsghdr'
        struct nlmsghdr hdr;
                        ^
src/rt.c:679:16: note: forward declaration of 'struct nlmsghdr'
        struct nlmsghdr hdr;
               ^
src/rt.c:680:22: error: field has incomplete type 'struct ndmsg'
        struct ndmsg msg;
                     ^
src/rt.c:680:16: note: forward declaration of 'struct ndmsg'
        struct ndmsg msg;
               ^
src/rt.c:681:55: error: use of undeclared identifier 'NLMSG_ALIGNTO'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
                                                      ^
src/rt.c:681:23: error: field has incomplete type 'struct rtattr'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
                      ^
src/rt.c:681:16: note: forward declaration of 'struct rtattr'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
               ^
src/rt.c:684:27: error: use of undeclared identifier 'RTM_NEWNEIGH'
        .hdr.nlmsg_type = RTM_NEWNEIGH,
                          ^
src/rt.c:685:28: error: use of undeclared identifier 'NLM_F_REQUEST'
        .hdr.nlmsg_flags = NLM_F_REQUEST,
                           ^
src/rt.c:688:26: error: use of undeclared identifier 'NUD_PERMANENT'
        .msg.ndm_state = NUD_PERMANENT,
                         ^
src/rt.c:689:26: error: use of undeclared identifier 'NTF_PROXY'
        .msg.ndm_flags = NTF_PROXY,
                         ^
src/rt.c:691:30: error: use of undeclared identifier 'NDA_DST'
        .dst_attr.rta_type = NDA_DST,
                             ^
src/rt.c:692:29: error: implicit declaration of function 'RTA_LENGTH' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        .dst_attr.rta_len = RTA_LENGTH(sizeof(req.dst)),
                            ^
src/rt.c:696:46: error: use of undeclared identifier 'AF_NETLINK'
    struct sockaddr_nl addr = { .nl_family = AF_NETLINK };
                                             ^
src/rt.c:696:24: error: variable has incomplete type 'struct sockaddr_nl'
    struct sockaddr_nl addr = { .nl_family = AF_NETLINK };
                       ^
src/rt.c:696:12: note: forward declaration of 'struct sockaddr_nl'
    struct sockaddr_nl addr = { .nl_family = AF_NETLINK };
           ^
src/rt.c:704:25: error: field has incomplete type 'struct nlmsghdr'
        struct nlmsghdr hdr;
                        ^
src/rt.c:704:16: note: forward declaration of 'struct nlmsghdr'
        struct nlmsghdr hdr;
               ^
src/rt.c:705:22: error: field has incomplete type 'struct ndmsg'
        struct ndmsg msg;
                     ^
src/rt.c:705:16: note: forward declaration of 'struct ndmsg'
        struct ndmsg msg;
               ^
src/rt.c:706:55: error: use of undeclared identifier 'NLMSG_ALIGNTO'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
                                                      ^
src/rt.c:706:23: error: field has incomplete type 'struct rtattr'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
                      ^
src/rt.c:706:16: note: forward declaration of 'struct rtattr'
        struct rtattr dst_attr __attribute__((aligned(NLMSG_ALIGNTO)));
               ^
src/rt.c:709:27: error: use of undeclared identifier 'RTM_DELNEIGH'
        .hdr.nlmsg_type = RTM_DELNEIGH,
                          ^
src/rt.c:710:28: error: use of undeclared identifier 'NLM_F_REQUEST'
        .hdr.nlmsg_flags = NLM_F_REQUEST,
                           ^
src/rt.c:713:26: error: use of undeclared identifier 'NUD_PERMANENT'
        .msg.ndm_state = NUD_PERMANENT,
                         ^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
gmake: *** [Makefile:35: src/rt.o] Error 1```