[R] libR.so doesn't export DATAPTR_OR_NULL - R.NET needs it?

[Kieren Johnstone]

I'm trying to use the excellent R.NET (github.com/rdotnet/rdotnet) to
involve R code from .NET Core on Linux.

As outlined here - https://github.com/rdotnet/rdotnet/issues/103 - it's
looking for DATAPTR_OR_NULL in libR.so, but it's not exported there. It is
exported in r.dll on Windows.

How can I diagnose and fix this issue, please?

Thanks
Kieren

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