Does not build with MaterialX 1.38.6

[lpapp]

I am trying to use MaterialX 1.38.6 and getting this:

pxr/usd/usdMtlx/reader.h:31:10: fatal error: 'MaterialXCore/Document.h' file not found
#include <MaterialXCore/Document.h>

[tallytalwar]

Filed as internal issue #USD-7946

[FlorianZ]

@lpapp we are currently building with MaterialX 1.38.4. My guess is that this header was relocated/removed with a newer version of MaterialX, as weird as that would be for a minor version bump. You could visit the USD MaterialX ASWF slack channel for expert help.

If you end up figuring this out, we welcome a contribution as always. Thank you!!

[JGamache-autodesk]

You can try merging Pablo's update to MaterialX 1.38.5, and since 1.38.6 does not contain any change that breaks the API USD is using, it should work out of the box.