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Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] Mac 10.6.8 libtiff build broken?
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Hi Bob,

Thanks for the fast reply.

> ./m4' was executed on last (not me this time).  It seems pretty likely
> that the macro used this time is much more modern than whatever is
> resident on my own machines.  Support for older systems might have been
> dropped by its maintainers.

> See http://www.gnu.org/software/autoconf-archive/ax_check_gl.html for a
> description of this macro.

The latest version allows for --with-gl=no which turns off GL entirely; 
shipping libtiff doesn't have this.

It looks like the rev from 2013/4/1 is the oldest one that supports this 
flag.

The --with-apple-frameworks functionality was lost on 2008/10/07, so 
it's now long since gone.

> The upshot is that you/we need to find a version of this macro which is
> most pleasing to all and make sure that it is used in the next libtiff
> release.

It looks like any version after 2013/4/1 would work.  It also looks like 
having a flag for framework paths available was tossed a long time ago. 
  As far as I can tell, the new macro is simply not finding OpenGL on 
newer OS X versions at all, so "losing" OS X autoconfigure support for 
libtiff may be moot.

> From my own observations, there is a distinct opinion among Apple OS-X
> users (and users of almost all Apple products) that users are never more
> than one product release behind.  This is evidenced by the Apple Store
> always being 100% full (and often with a waiting line outside) of
> customers who already have perfectly functional older Apple products.
> The maintainers of AX_CHECK_GL might only have fading memories of older
> OS-X releases.

It is more difficult to maintain support for old versions of the OS on 
OSX than Windows. :-)

With that in mind, it looks like support for OpenGL frameworks bit the 
dust in the end of 2008 - at the time OS X 10.6.8 _was the lastest_! 
This looks more like someone did a "big rework" of the GL macros and 
splatted the Mac by accident.

cheers
Ben

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