CVS autoconf does this instead. I presume the AC_INCLUDES_DEFAULT
fixes the same problem in a different way?
AC_DEFUN([_AC_FUNC_FORK],
[AC_CACHE_CHECK(for working fork, ac_cv_func_fork_works,
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[
/* By Ruediger Kuhlmann. */
if (fork() < 0)
exit (1);
exit (0);
])],
[ac_cv_func_fork_works=yes],
[ac_cv_func_fork_works=no],
[ac_cv_func_fork_works=cross])])]
)# _AC_FUNC_FORK
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