FreeBSD compilation fail #30

Hi,
uname -a
FreeBSD freebsd1 10.2-RELEASE-p9 FreeBSD 10.2-RELEASE-p9 #0: Thu Jan 14 01:32:46 UTC 2016 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
compiler
clang 3.4.1

The problem while compiling:

/home/alex/Downloads/libsocket-master/C/inet/libinetsocket.c:957:43: error: no member named 'ifr_ifindex' in 'struct ifreq'
mreq4.imr_ifindex = interface.ifr_ifindex;
~~~~~~~~~ ^
/home/alex/Downloads/libsocket-master/C/inet/libinetsocket.c:997:48: error: no member named 'ifr_ifindex' in 'struct ifreq'
mreq6.ipv6mr_interface = interface.ifr_ifindex;
~~~~~~~~~ ^
/home/alex/Downloads/libsocket-master/C/inet/libinetsocket.c:1000:60: error: use of undeclared identifier 'IPV6_ADD_MEMBERSHIP'
if ( -1 == check_error(setsockopt(sfd,IPPROTO_IPV6,IPV6_ADD_MEMBERSHIP,&mreq6,sizeof(struct ipv6_mreq))) )

Temporary solution:
Add to ./C/inet/libnetsocket.c:

#ifdef __FreeBSD__
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP    IPV6_LEAVE_GROUP
#endif

Modify line ~960

# ifdef __FreeBSD__
    mreq4.imr_ifindex = interface.ifr_ifru.ifru_index;
#else       
    mreq4.imr_ifindex = interface.ifr_ifindex;
# endif

And modify line ~1005

# ifdef __FreeBSD__
        mreq6.ipv6mr_interface = interface.ifr_ifru.ifru_index;
#else       
        mreq6.ipv6mr_interface = interface.ifr_ifindex;
# endif

Modified file:
libinetsocket.c.tar.gz
I have attached the modified file.
Thanks.