lwt version 2.1.1

machine: Sun sparc with SunOS 5.10
ocaml: 3.12.0
ocamlfind 1.2.6

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in lwt-2.1.1 directory,
after typing 'make'

I got errors of the type: no member named 'blah'.

one example:

src/unix/stubs/lwt_unix_stubs.c:159 error: 'struct msghdr'
     has no member named 'msg_controllen'

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How do I make it right ?

thanks
HP