autoconf question

[Brian May <bam@debian.org>]

Hello,

can anybody tell me how autoconf finds builtin macros like
AC_MSG_WARN?

This use to work, seconds ago, I promise!!!

In fact, it was working right up to the step where the Makefile decided
to rerun autoconf, for some unexplainable reason (it was up-to-date).

However, now if I try:

[634] [scrooge:bam] ~/source/notmine/amavis-perl-11 >autoconf2.13      

but now it reports a lot of undefined macros errors. macros,
which I believe should be predefined (see below).

So I tried autoconf2.50:

[635] [scrooge:bam] ~/source/notmine/amavis-perl-11 >autoconf2.50 
configure.in:176: error: possibly undefined macro: AC_CHECK_LIB
configure.in:186: error: possibly undefined macro: AC_CHECK_HEADERS
configure.in:191: error: possibly undefined macro: AC_MSG_WARN

so how does autoconf normally find these macros?

Thanks in advance.