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Date: Sun, 15 May 2011 02:45:35 -0700
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Subject: autoconf 2.60+ support
From: rasmus@lerdorf.com (Rasmus Lerdorf)

As you may have noticed, I have fixed the autoconf stuff to work with 
autoconf 2.60+ in PHP_5_4 and trunk. In the past I have tried to make it 
support both <2.60 and >=2.60 at the same time and it never worked. 
autoconf 2.60 was released in June 2006, so nearly 5 years ago and it is 
in every modern distro at this point. Most distros also have the ability 
to run older versions concurrently so you should be able to build 5.3 
and 5.4 on the same system. On Ubuntu I have to set PHP_AUTOCONF to 
autoconf2.59 before running ./buildconf in 5.3, for example. With 5.4 
you should no longer need to do that.

Let me know if there are any autoconf-related problems and we will get 
them tracked down.

-Rasmus