in reply to [SOLVED]: Can't find 'boot_...' symbol when trying to use an installed XS module

Rubber duck debugging to the rescue once again...

In my XS file, I had this:

MODULE = MCP3008 PACKAGE = MCP3008

Whereby these two directives require the full package/module name:

MODULE = RPi::ADC::MCP3008 PACKAGE = RPi::ADC::MCP3008

After that change, all is well in the world again.