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[root@TURMERIC udp-broadcast-relay]# make
c99   -Wall main.c -o udp-broadcast-relay
main.c:64:1: error: unknown type name ‘u_char’
 static u_char gram[4096] = {
 ^
main.c: In function ‘main’:
main.c:80:2: error: unknown type name ‘u_char’
  u_char id;
  ^
main.c:81:2: error: unknown type name ‘u_char’
  u_char ttl;
  ^
main.c:100:2: error: unknown type name ‘u_char’
  u_char pkt_infos[16384];
  ^
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

[root@TURMERIC udp-broadcast-relay]# c99 --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

TTL not found on incoming packet
: Success

br0       Link encap:Ethernet  HWaddr 00:23:69:4A:B7:0B  
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1

vlan2     Link encap:Ethernet  HWaddr 00:23:69:4A:B7:0C  
          inet addr:128.61.105.148  Bcast:128.61.107.255  Mask:255.255.252.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1