Hi Matthias, 
Yes, they are. I have just uninstalled them via Cygwin setup. Should I 
uninstall libffi as well?

On Thursday, 21 July 2022 at 13:22:48 UTC+8 Matthias Koeppe wrote:

> Are these cygwin packages installed?  bzip2 libbz2-devel xz liblzma-devel 
>
> On Wednesday, July 20, 2022 at 10:01:30 PM UTC-7 lucas....@gmail.com 
> wrote:
>
>> Apologies, my log files are here
>>
>>
>>
>> On Thursday, 21 July 2022 at 12:47:16 UTC+8 Lucas Tan wrote:
>>
>>> Hi Matthias, 
>>>
>>> I ran  "make bzip2-clean liblzma-clean libffi-clean xz-clean" twice to 
>>> ensure that the files are removed. 
>>> I check for the following message: "No legacy uninstaller found for 
>>> 'xz'; nothing to do", for all files. 
>>> I have also ensured that I have python3.9 installed with "python3 
>>> --version"
>>> After running the above, I run "./configure" once more as suggested by 
>>> John H Palmieri above. 
>>>
>>> I'm not sure if this is relevant, but I noticed these messages when 
>>> running "make": 
>>> *(first line of xz)* 
>>> [xz-5.2.5] Using cached file 
>>> /home/Lucas/sage/sage-9.6/upstream/xz-5.2.5.tar.gz
>>> [xz-5.2.5] xz-5.2.5
>>> [xz-5.2.5] ====================================================
>>> [xz-5.2.5] Setting up build directory for xz-5.2.5
>>> [xz-5.2.5] Finished extraction
>>> *(similarly for libffi, the cached file is used)*
>>>
>>> *(first line of python3)*
>>> [python3-3.10.3] Using cached file 
>>> /home/Lucas/sage/sage-9.6/upstream/Python-3.10.3.tar.xz
>>> [python3-3.10.3] python3-3.10.3
>>> [python3-3.10.3] ====================================================
>>> [python3-3.10.3] Setting up build directory for python3-3.10.3
>>> [python3-3.10.3] Finished extraction
>>> *(shortly later...)*
>>> [python3-3.10.3] Thread model: posix
>>> [python3-3.10.3] Supported LTO compression algorithms: zlib zstd
>>> [python3-3.10.3] gcc version 11.3.0 (GCC)
>>> [python3-3.10.3] ****************************************************
>>> [python3-3.10.3] Package 'python3' is currently not installed
>>> [python3-3.10.3] Uninstalling 'python3' with legacy uninstaller
>>> [python3-3.10.3] Cleaning out old python / python3 / python3 venv 
>>> binaries
>>> [python3-3.10.3] Configuring python3-3.10.3
>>>
>>> On Thursday, 21 July 2022 at 11:11:42 UTC+8 Lucas Tan wrote:
>>>
>>>> Hi Matthias, 
>>>>
>>>> I would believe so. 
>>>> ```
>>>> $ apt-cyg install python39
>>>> Package python39 is already installed, skipping
>>>>
>>>> $ apt-cyg install python3
>>>> Package python3 is already installed, skipping
>>>> ```
>>>> On Thursday, 21 July 2022 at 11:08:50 UTC+8 Matthias Koeppe wrote:
>>>>
>>>>> Did you install the cygwin python3.9 packages?
>>>>>
>>>>> On Wednesday, July 20, 2022 at 8:05:47 PM UTC-7 lucas....@gmail.com 
>>>>> wrote:
>>>>>
>>>>>> Hi Matthias, 
>>>>>>
>>>>>> I keep receiving the error: package: python3-3.10.3 failed to build. 
>>>>>> How do I restrict "make" to python 3.9?
>>>>>>
>>>>>> Sincerely, 
>>>>>> Lucas
>>>>>>
>>>>>> On Thursday, 21 July 2022 at 10:34:41 UTC+8 Matthias Koeppe wrote:
>>>>>>
>>>>>>> On Wednesday, July 20, 2022 at 7:26:06 PM UTC-7 lucas....@gmail.com 
>>>>>>> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>> I could not install several packages using "apt-cyg". Some packages 
>>>>>>>> could not be found, and some packages are not of the same build or 
>>>>>>>> version 
>>>>>>>> (e.g. apt-cyg install python3 -> python 3.9, not python 3.10 as used 
>>>>>>>> by 
>>>>>>>> "make"). 
>>>>>>>>
>>>>>>>
>>>>>>> That's normal. There's no python 3.10 for Cygwin. Use Cygwin's 
>>>>>>> python 3.9 package.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>

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