Hi folks,
i am using Linux Mint and created and Arduino folder in my home folder. In the Arduino folder i have 3 folders: IDE, Code, libraries.
The IDE folder has again two subfolders:
arduino-2.0.3 and arduino-1.8.19.
The arduino-1.8.19 was installed with the install.sh script which created a desktop icon and the file type association.
The arduino-2.0.3 is the appimage file set as executable.
if i compile my sketches with the old 1.x.x version everything goes fine.
If i try top compile those projects with 2.x version it complains it can't find standard stuff like #include <avr/wdt.h>
Can someone point me to the correct direction, what needs to be done for IDE 2.x to accept all this "standard stuff" just like the old 1.x IDE ?
Many thanks in advance.