In porting over my 3.9 OOT to 3.10,  I have the import error:

>>> import hpsdr
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/gnuradio/hpsdr/__init__.py", line
18, in <module>
    from .hpsdr_python import *
ImportError: generic_type: type "hermesNB" referenced unknown base type
"gr::block"
>>>

When I went through this back in 3.9, it was due to a version problem in
pybind11.

I have installed pybind11-dev version 2.5.0 from the tarball.   Ubuntu
20.04 package manager
has reverted to 2.4.3 (after having been at 2.5.0 for awhile).

Is this still a pybind11 versioning problem?  If so, what version of
pybind11 should I be
using to build my OOT for 3.10.1.1 ?


-- Tom, N5EG

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