Core13 is fairly restricted and missing many needed headers. It would be nice to have MicroCore instead.
Migrate core13 ATtiny13 library to MicroCore
Might be a good idea to bump or subscribe this issue over on the MicroCore github…
MCUdude is current working on porting the MiniCore (as opposed to MicroCore) board support to a PlatformIO friendly state, so once he’s done that, hopefully doing the same to MiniCore will be a snap.
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