we could use a bit of help to iron out a kink in the Unix build process:
Currently, our approach at identifying the version of the installed
OpenEXR library is based on the `pkg-config` tool, which does not seem
to be available on all systems (example: Mac OS X darwin 15.6.0).
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`.
So it would be neat if someone with some rudimentary knowledge of
Automake and a bit of Unix know-how could review the current mechanism,
and amend it so that the OpenEXR version information is obtained in a
more portable fashion when possible, and the `pkg-config`-based approach
is only used as a fallback solution.
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