Compile problems on Mac OSX

[Ian Gough]

Using a snapshot from Friday or so:

 

g++ -DHAVE_CONFIG_H -I. -I. -I../include -I../src -DCCXX_EXPORT_LIBRARY -I/usr/local/include -D_GNU_SOURCE -Wall -ansi -pedantic -I../include -c socket.cpp -MT socket.lo -MD -MP -MF .deps/socket.TPlo  -fno-common -DPIC -o .libs/socket.lo
cc1plus: warning: changing search order for system directory "/usr/local/include"
cc1plus: warning:   as it has already been specified as a non-system directory
socket.cpp: In member function `ost::Socket::Error ost::UDPSocket::join(const
   ost::InetMcastAddress&, int)':
socket.cpp:907: aggregate `ost::ip_mreqn group' has incomplete type and cannot
   be defined
socket.cpp: In member function `ost::Socket::Error
   ost::UDPSocket::getInterfaceIndex(const char*, int&)':
socket.cpp:932: aggregate `ost::ip_mreqn mreqn' has incomplete type and cannot
   be defined
socket.cpp:946: `SIOCGIFINDEX' undeclared (first use this function)
socket.cpp:946: (Each undeclared identifier is reported only once for each
   function it appears in.)
socket.cpp:949: `struct ifreq' has no member named `ifr_ifindex'