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The following line seems to be where the C++14 standard is set. However, sparrow uses C++17 (20?) features like std::transform that gcc will not import when the standard level is set to 14.

Sparrow/Embed/Common.h: In function 'std::string upper(std::string)':
>> 988     Sparrow/Embed/Common.h:107:8: error: 'transform' is not a member of 'std'

This setup looks incomplete to me:

How do you use an existing spglib with the scine utilities?

I notice I can build scine-utilities fine with gcc 11.3.0 but with 12.2.0 I get errors like

>> 828    /tmp/root/spack-stage/spack-stage-scine-utilities-6.0.0-tyayl46ngbiux5dg6kqdx7fubcop3agi/spack-src/src/Utils/Utils/IO/ChemicalFileFormats/ChemicalFileHandler.cpp:24:20: error: 'unique_ptr' is not a member of 'std'

I don't fully understand what's happening here - unique_ptr should have been introduced with c++11 and  I see the c++ standard is set to 17 here

What is the reasoning for the very tight pinning of pybind11? Is the whole scine tool chain only compatible with version 2.6.2? Given that there is already pybind 2.9.1 this seems a rather drastic and limiting choice.