The sage_numerical_backends_* packages are on their way out anyway.
Coin support will switch to go through CVXPy 
in https://trac.sagemath.org/ticket/34251, and Gurobi/CPLEX likewise in a 
follow up ticket

On Saturday, August 6, 2022 at 1:09:37 PM UTC-7 John H Palmieri wrote:

> Thank you for the link. With this ticket, the gurobi and cplex backends 
> still fail because I don't have gurobi and cplex installed. It would be 
> nice if that was detected earlier in the process and the build failed right 
> away. Actually, it is detected early in the process:
>
>   /bin/sh: gurobi.sh: No such file or directory
>   GUROBI_HOME is not set, or it does not point to a directory with a 
> Gurobi installation.  Trying to link against -lgurobi
>
> but the installation proceeds anyway. But this is a separate issue.
>
> On Saturday, August 6, 2022 at 12:39:00 PM UTC-7 Matthias Koeppe wrote:
>
>> This one is https://trac.sagemath.org/ticket/34221
>>
>> On Saturday, August 6, 2022 at 11:55:36 AM UTC-7 John H Palmieri wrote:
>>
>>> Also, the various sage_numerical_backend_* packages fail to build, with 
>>> errors like
>>>
>>>
>>>   Error compiling Cython file:
>>>   ------------------------------------------------------------
>>>   ...
>>>   from sage.numerical.backends.generic_backend cimport GenericBackend
>>>   ^
>>>   ------------------------------------------------------------
>>>
>>>   check_add_col_untyped_args.pyx:1:0: 
>>> 'sage/numerical/backends/generic_backend.pxd' not found
>>>
>>>
>>> Also downgrade? Is there a ticket for this?
>>>
>>> On Friday, August 5, 2022 at 11:07:51 PM UTC-7 Matthias Koeppe wrote:
>>>
>>>> On Friday, August 5, 2022 at 9:49:21 PM UTC-7 John H Palmieri wrote:
>>>>
>>>>> The following packages do not build for me on OS X 12.5 (Monterrey), 
>>>>> Intel chip:
>>>>>
>>>>>    - polylib (#33758)
>>>>>    - symengine_py (#34141)
>>>>>    - p_group_cohomology (#30787)
>>>>>    - r_jupyter
>>>>>    - rubiks
>>>>>    
>>>>> I propose that these be downgraded from optional to experimental until 
>>>>> the issues are fixed. What do people think?
>>>>>
>>>>>
>>>> Also on various Linux platforms (
>>>> https://github.com/sagemath/sage/actions/runs/2777704587) I see 
>>>> failures for
>>>> symengine_py, 
>>>> p_group_cohomology, 
>>>> r_jupyter
>>>>
>>>> So these 3 definitely need to be changed to "experimental".
>>>>
>>>>
>>>>  
>>>>
>>>

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