don't they? The GH seems to have instructions for the SO, and there is an SO folder in the code, don't know if it's that or if it's all of it.
Discussion
Can you post a link to the instructions for the SO?
it's just a one liner but it references the SO :
https://github.com/buildonspark/spark?tab=readme-ov-file#bitcoind and the folder i mentioned : https://github.com/buildonspark/spark/tree/main/spark/so
again don't know if this is it. this is beyond my knowledge.