When I include the pinMode call to define pins the compile fails. Arduino.h is included in the file.
The stand alone blink program does compile and run successfully.
Please show your platformio.ini, the minimal test code and the error message.
It is a bit of a ‘kludge’ but I have this problem when using with espressif controllers and when WiFinina.h is included in libdeps.
I delete WiFinina.h and I am able to compile and run without problems.
I am sure someone will tell me I shouldn’t do this but a long time ago I delved into pinmode and my boards were not defined. (If I remember correctly)