Unable to compile on CentOS 7 about udp-broadcast-relay HOT 3 CLOSED

[root@TURMERIC udp-broadcast-relay]# CFLAGS='-Du_char="unsigned char"'
[root@TURMERIC udp-broadcast-relay]# export CFLAGS
[root@TURMERIC udp-broadcast-relay]# make
c99 -Du_char="unsigned char"  -Wall main.c -o udp-broadcast-relay
main.c: In function ‘main’:
main.c:235:3: warning: implicit declaration of function ‘bcopy’ [-Wimplicit-function-declaration]
   bcopy((struct sockaddr_in *) &reqbuf.ifr_addr,
   ^
main.c:316:4: error: ‘u_short’ undeclared (first use in this function)
  *(u_short*)(gram + 22) = (u_short) htons(port);
    ^
main.c:316:4: note: each undeclared identifier is reported only once for each function it appears in
main.c:316:12: error: expected expression before ‘)’ token
  *(u_short*)(gram + 22) = (u_short) htons(port);
            ^
main.c:316:37: error: expected ‘;’ before ‘htons’
  *(u_short*)(gram + 22) = (u_short) htons(port);
                                     ^
main.c:347:59: error: dereferencing pointer to incomplete type
      rcv_ifindex = ((struct in_pktinfo *) CMSG_DATA(cmsg))->ipi_ifindex;
                                                           ^
main.c:374:13: error: expected expression before ‘)’ token
   *(u_short*)(gram + 20) = (u_short) rcv_addr.sin_port;
             ^
main.c:374:38: error: expected ‘;’ before ‘rcv_addr’
   *(u_short*)(gram + 20) = (u_short) rcv_addr.sin_port;
                                      ^
main.c:377:13: error: expected expression before ‘)’ token
   *(u_short*)(gram + 24) = htons(8 + len);
             ^
main.c:378:13: error: expected expression before ‘)’ token
   *(u_short*)(gram + 2) = htons(28 + len);
             ^
main.c:392:21: error: expected expression before ‘)’ token
     ntohs(*(u_short*) (gram + 22)), /* dst port */
                     ^
make: *** [udp-broadcast-relay] Error 1