# undefined symbol: PyExc\_ValueError

**URL:** https://discourse.paraview.org/t/undefined-symbol-pyexc-valueerror/5494
**Category:** In Situ Support
**Created:** [October 5, 2020, 8:18am UTC](https://discourse.paraview.org/t/undefined-symbol-pyexc-valueerror/5494 "2020-10-05T08:18:16Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![utkarsh.ayachit](https://discourse.paraview.org/user_avatar/discourse.paraview.org/utkarsh.ayachit/32/39_2.png) [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)
#### Post date: [October 6, 2020, 1:24pm UTC](https://discourse.paraview.org/t/undefined-symbol-pyexc-valueerror/5494/4 "2020-10-06T13:24:33Z")

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@ben.boeckel, what’s the reason to have `VTK_PYTHON_OPTIONAL_LINK` ON by default? Seems it me it’s only needed for wheels, in which case shouldn’t we only turn it ON when building wheels alone?

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