I believe it's only when using USE_ZLIB_WINAPI that the min/max issue happens.  
With that option enabled, zlib.h drags in the windows headers, causing the 
conflict.  There are places in IlmBase that use windows includes directly 
(IlmThread) already use the #define NOMINMAX prior to the include to avoid this.

Question: does anybody really count on the USE_ZLIB_WINAPI option?

From: openexr-devel-bounces+ehanway=ilm....@nongnu.org 
[mailto:openexr-devel-bounces+ehanway=ilm....@nongnu.org] On Behalf Of Karl 
Rasche
Sent: Wednesday, July 16, 2014 11:08 AM
To: Larry Gritz
Cc: openexr-devel@nongnu.org
Subject: Re: [Openexr-devel] 2.2.0 release plans

It sure looks like std::min/max usage is contained to within .cpp files.

There's a variety of other places that use the same functions - but only 
IlmDwaCompressor.cpp was causing problems? That seems a bit wierd.

Karl

On Wednesday, July 16, 2014, Larry Gritz 
<l...@larrygritz.com<mailto:l...@larrygritz.com>> wrote:
Another application that uses the OpenEXR libraries will #include the OpenEXR 
headers, but will not actually use the OpenEXR build system and its command 
line preprocessor settings.

So if this issue extends to any of the header files, you need to fix it in the 
headers, or it'll be broken in the user's app
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