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From: jasonr (Jason Rumney) @  f2s.com
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Subject: Re: Can't build Emacs 21.3 on AIX 5.1
Date: 06 May 2004 19:50:49 +0100
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gwinn@uk.ibm.com writes:

> on in the make with errors relating to header files. I noticed in the
> output from configure that it correctly identifies the platform as
> powerpc-ibm-aix5.1.0.0 but a few lines further on I see
> 
> checking for AIX... no
> 
> This is odd, so I looked in the configure script and it prints that
> line when it finds that confdefs.h is missing.

confdefs.h should not be missing. The configure script creates
confdefs.h here:

  # AIX cpp loses on an empty file, so make sure it contains at least a newline.
  echo > confdefs.h

It prints "checking for AIX... no" when a confdefs.c with the
following contents run through the preprocessor does not contain "yes".

  #include "confdefs.h"
  #ifdef _AIX
    yes
  #endif

So it seems that your compiler does not define _AIX.