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Please try to find out whether _SGIAPI is defined anywhere
in /usr/include/* or /usr/include/*/*; most likely, some of
the -D defines suppress the definition of _SGIAPI.

If so, a solution might be to define _SGIAPI in addition to
the other defines; see the definition of _GNU_SOURCE,
_BSD_VISIBLE etc in configure.in. However, it would be good
to find some definition for _SGIAPI - perhaps we are
supposed to define _SGI_SOURCE, or _SGI_GIMME_EVERYTHING :-)