I installed python 3.13, and used  
./configure --with-system-python3=python3.13

Still the same error messages. Note: I had no problem building sage 10.7 on 
Fedora 42 with gcc 15.

On Wednesday, September 24, 2025 at 7:07:20 PM UTC-5 Nils Bruin wrote:

> dnf install ptyhon3.13
>
> You just need to find a way to tell sage to use python3.13 and not 
> python3.14. There must be a way for that, but I don't know it.
>
> Incidentally, on Fedora 42 there is already the problem that sage doesn't 
> build on gcc15, so you need to install gcc14 and tell sage to build with 
> that; see 
> https://groups.google.com/g/sage-devel/c/tJCbTnelvSg/m/IfzQF0HGBQAJ . I 
> would imagine you'll need to do that on Fedora 43 as well, until gcc15 is 
> fully supported for building sage.
>
> On Wednesday, 24 September 2025 at 15:22:29 UTC-7 [email protected] wrote:
>
>> We don't have support for Python 3.14 yet.
>> does Fedora 43 offer a way to install Python 3.13 (as a secondary 
>> Python3)  ?
>>
>>
>> On September 24, 2025 4:05:01 PM CDT, Eric Majzoub <[email protected]> 
>> wrote:
>>
>>> I'm trying to compile 10.7 or 10.8.beta4 on Fedora 43 beta. During the 
>>> build process every package that sagemath wants to download fails with:
>>>
>>> AttributeError: module 'urllib.request' has no attribute 'FancyURLopener'
>>>
>>> Fedora 43 is using python 3.14.
>>> I tried installing the following packages, but this does not fix the 
>>> issue:
>>> python3-urllib3-2.5.0-3.fc43.noarch 
>>> python3-urllib3+socks-2.5.0-3.fc43.noarch
>>> python3-MultipartPostHandler2-0.1.5-41.fc43.noarch
>>>
>>>
>>>

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