On 05/18/2017 02:25 PM, clipka wrote:
> 
> My guess is that this approach was originally used because older
> versions of OpenEXR were pretty taciturn when it came to disclosing
> their version number.
> 
> However, modern versions of OpenEXR are much more cooperative in this
> respect, so getting the version information of those should be well
> possible even without `pkg-config`.
> 
> 

Still looking, but it might take a while to work around pkg-config.

The real reason for the usage isn't the version determination but rather 
  updating the compile include and link libraries via updating the 
environment variables CPPFLAGS and LIBS, respectively.

The commands:

  pkg-config --cflags OpenEXR

and

  pkg-config --libs OpenEXR

are used to get what those respective updates should be.

The Simple DirectMedia Layer needs this sort of update too. As part of 
its package a built in command called "sdl-config" is provided which 
works as a stand in for pkg-config. I've found no similar mechanism for 
openexr.

I'm trying now to figure out where pkg-config gets its information with 
the idea maybe we could duplicate the function it performs.

Interesting too - I'm not sure the usual configure include / library 
overrides will work with openexr. The mechanism is certainly different 
than the jpeg set up if it does.

Bill P.

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