On February 3, 2026 7:28:00 AM CST, Eric Gourgoulhon <[email protected]> 
wrote:
>Le mardi 3 février 2026 à 01:59:18 UTC+1, [email protected] a écrit :
>
>Have you built Python from source? That's very flaky, and should not 
>be done, IMHO.
>
>
>Unfortunately, since Sage 10.9.beta4, it has to be done on Ubuntu 24.04 
>because the system python (3.12.3) is considered too old by Sage: from 
>config.log, we have:
>
>real_configure:157002: result: python3:                        no suitable 
>system package; standard, SPKG version 3.12.5 will be installed
>
>Is there any strong reason to prefer Python 3.12.5 over 3.12.3 in Sage >= 
>10.9.beta4 ?
>(for Sage 10.9.beta3, the Ubuntu system python was considered OK). 

I cannot think of any reason for this, other than some system package not 
installed.

I can say more if you post the top level config.log

Dima

>
>Eric. 
>

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