bug#35322: AM_PATH_PYTHON incompatible with Python frameworks on macOS

[Joshua Root]

On 2021-3-3 10:54 , Karl Berry wrote:
>      I wonder if it might also make sense to offer a configure option to set
>      PYTHON_PREFIX?
>
> I think that would be great (--pythondir, --pythonexecdir or some
> such). Would you mind looking into that? I've never played around with
> the options Automake adds and have unfortunately limited time to
> research the code. But I will eventually if needed.

OK, here's a patch to add --with-python_prefix and 
--with-python_exec_prefix options. It applies on top of my previous patch.

Note that the paths given to these options aren't edited to use the 
${prefix} and ${exec_prefix} variables when they are subdirs thereof, 
since I figure if you set a specific value with these options you really 
mean it. Note also that if --with-python_prefix is given but 
--with-python_exec_prefix is not, PYTHON_EXEC_PREFIX takes the value 
that was given to --with-python_prefix. I think this is more convenient 
on the whole, since setting a custom PYTHON_PREFIX but wanting to keep 
the automatically determined value of PYTHON_EXEC_PREFIX seems like it 
would be a pretty rare scenario.

- Josh

add-with-python_prefix-option.patch
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