Port interrupt.

[TomGitHub01]

When using "ISR(PORTC_PORT_vect){}", I get an error message (multiple definition of `__vector_24') (Attiny 1627).

If I use the Arduino DIE, I can select the option "I will enable them manually per docs" and the error disappears.

What setting do I need to choose in "platformio.ini"?

[TomGitHub01]

After 2 hours of try end error,
i have edit " build_unflags = -D "CORE_ATTACH_ALL" " in platformio.ini and it works.
No errors after build.