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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Recent change to xfns.c breaks compilation
Date: Tue, 15 Jul 2003 07:02:19 -0400
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    I'm not an expert on autoconf, so I really cannot say.

    However, I think the simpler form to find the header (and define
    either HAVE_LIBPNG_PNG_H or HAVE_PNG_H) should work:

	AC_CHECK_HEADERS(libpng/png.h,,
			 [AC_CHECK_HEADERS(png.h)])

Could someone say if this is correct?