"undefined symbol" in C extension module

[Robert Latest]

Dan Stromberg wrote:
> Perhaps try:
> https://stromberg.dnsalias.org/svn/find-sym/trunk
>
> It tries to find symbols in C libraries.
>
> In this case, I believe you'll find it in -lpythonx.ym

Thanks! Found out that ldd produces many errors also with working python
libraries. Turns out I tried to revive a package from v2.7. Need to adapt
it to 3.x