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My solution was to hack the three following files:

lib/kernel/socket.c failed to compile. Line 25: redefinition
of 'struct in_pktinfo' => comment

lib/mrt/trace.c failed to compile. Line 499: 'u_char'
promoted to 'int' => va_arg(ap, int)

/lib/mrt/buffer.c failed to compile. Line 379: 'short int'
promoted to 'int' => va_arg(ap, int)