AC_PROVIDE_IFELSE, AC_FATAL, AC_DEFUN_ONCE not documented

Karl Berry <[email protected]>
Newsgroups gmane.comp.sysutils.autoconf.bugs
Message-ID <[email protected]> 
It seems AC_PROVIDE_IFELSE, AC_FATAL, AC_DEFUN_ONCE are not mentioned in
the autoconf manual.

I noticed them in Akim's ChangeLog entry from 2000, FWIW.
It makes me wonder about somehow dumping all AC_* names and comparing to
the manual ...

2000-11-01  Akim Demaille  <[email protected]>

	Move the `defun' handling into M4sugar.
        [...]
	(AC_DEFUN, AC_DEFUN_ONCE, _AC_REQUIRE, AC_REQUIRE)
	AC_PROVIDE_IFELSE, AC_FATAL): Reimplement atop M4sugar.
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