Thanks! I was able to figure it out eventually, so I'll write it down here for myself and anyone else who might run across this post:
* I cloned this repo: github.com/indilib/indi-3rdparty
* I'm using INDI 1.9.6, so I found the commit that corresponded to that tag (github.com/indilib/indi-3rdparty/releases/tag/v1.9.6) and checked that out (
git checkout c9f706d
).
* From there, I built the particular drivers I needed (indi-qhy, indi-asi, and indi-eqmod in my case) by following the instructions in INSTALL - apparently the more recent version of cmake has slightly different syntax, so I used