Please see https://github.com/miguelmarco/libbraiding/pull/4

On Mon, Nov 4, 2024 at 10:06 PM mmarco <miguel.a.ma...@gmail.com> wrote:
>
> I have no experience on that whatsoever, so if you could do ir (or guide me 
> with it), i would really appreciate it.
>
> El lunes, 4 de noviembre de 2024 a las 17:52:07 UTC+1, dim...@gmail.com 
> escribió:
>>
>> Hi Miguel,
>>
>> On Monday, November 4, 2024 at 10:15:01 AM UTC mmarco wrote:
>>
>> If I add a .pc file to libbraiding, would it interfere with the install 
>> location in the sage distribution?
>>
>>
>> as long as it's done right, it will be of help.
>> It's a very short addition with autotools.
>> Feel free to ask me to do this for you, or I can review your changes.
>>
>> Dima
>>
>>
>>
>> El viernes, 1 de noviembre de 2024 a las 13:44:14 UTC+1, Michael Orlitzky 
>> escribió:
>>
>> On 2024-11-01 04:32:35, Nils Bruin wrote:
>> > There is obviously the "package version", but as I now see, the "equivalent
>> > system packages" don't seem to encode an explicit version restriction at
>> > all. So I guess Michael's comment on spkg-configure.m4 is probably
>> > appropriate. I guess explicit testing for exactly what you need there would
>> > be the most flexible, but the requirement there could also just be a check
>> > on the installed version number, I guess. In that case, sage installation
>> > should detect whatever system-installed libbraiding there is, run its test
>> > (look up the version number and compare it with the value) and then decide
>> > if that's good enough.
>>
>> In general, and with libbraiding, there's no easy way to tell the
>> exact version number of a package that's installed. In that case, you
>> have to use the old-fashioned (i.e. simple and reliable) method of
>> testing for the features that you want rather than the version you
>> think has them.
>>
>> To do a version check, libbraiding would have to supply a pkg-config
>> (*.pc) file. The pc file basically just encodes information, like the
>> version, about a package in a standard place. Sage would then run
>> pkg-config to read the file and get the installed version.
>>
>> For version information alone, pkg-config is of dubious benefit, but
>> it has other uses like making it possible to install packages in
>> non-standard locations (say you need both gtk3 and gtk4 installed at
>> the same time). And if the *.pc file is there anyway, the easy thing
>> to do is use it.
>
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