You could absolutely write an Autoconf script that runs those tests by default, but has overrideable behavior. You can make custom Autoconf macros to detect wha

You could absolutely write an Autoconf script that runs those tests by default, but has overrideable behavior. You can make custom Autoconf macros to detect whatever arbitrary thing you want. At the core, an Autoconf macro is just a chunk of shell script that sets some environment variables with the result.