[MacPorts] #61490: py38-matplotlib: RuntimeError: Polyfit sanity test emitted a warning, most likely due to using a buggy Accelerate backend.

[MacPorts]

#61490: py38-matplotlib: RuntimeError: Polyfit sanity test emitted a warning, most
likely due to using a buggy Accelerate backend.
-------------------------------------+--------------------
  Reporter:  mf2k                    |      Owner:  (none)
      Type:  defect                  |     Status:  new
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:
      Port:  py-numpy py-matplotlib  |
-------------------------------------+--------------------
Description changed by mf2k:

Old description:

> Seeing this on macOS 11.0.1. Xcode 12.2.
>
> {{{
> :info:destroot     import numpy as np
> :info:destroot   File
> "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8
> /site-packages/numpy/__init__.py", line 286, in <module>
> :info:destroot     raise RuntimeError(msg)
> :info:destroot RuntimeError: Polyfit sanity test emitted a warning, most
> likely due to using a buggy Accelerate backend. If you compiled yourself,
> see site.cfg.example for information. Otherwise report this to the vendor
> that provided NumPy.
> }}}
>
> {{{
> $ port installed py38-numpy
> The following ports are currently installed:
>   py38-numpy @1.19.4_0+gfortran+openblas (active)
> }}}
>
> Error occurs while building py-matplotlib but may be in py-numpy.

New description:

 Seeing this on macOS 11.0.1. Xcode 12.2.

 {{{
 :info:destroot     import numpy as np
 :info:destroot   File
 "/opt/local/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8
 /site-packages/numpy/__init__.py", line 286, in <module>
 :info:destroot     raise RuntimeError(msg)
 :info:destroot RuntimeError: Polyfit sanity test emitted a warning, most
 likely due to using a buggy Accelerate backend. If you compiled yourself,
 see site.cfg.example for information. Otherwise report this to the vendor
 that provided NumPy.
 }}}

 {{{
 $ port installed py38-numpy
 The following ports are currently installed:
   py38-numpy @1.19.4_0+gfortran+openblas (active)
 }}}

 Error occurs while staging py-matplotlib but may be in py-numpy.

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Ticket URL: <https://trac.macports.org/ticket/61490#comment:1>
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