I have now gotten rid of the error where i cannot find the core library, just by moving from my school computer (which only uses network disks) to my laptop.
Now I only have trouble with that functions are not declared, so there is something wrong with the includes.
Invoking: Print Size
avr-size --format=avr --mcu=atmega1281 Template.elf
AVR Memory Usage
Program: 8960 bytes (6.8% Full)
(.text + .data + .bootloader)
Data: 1001 bytes (12.2% Full)
(.data + .bss + .noinit)
Finished building: sizedummy
but still, many errors on "function could not be resolved."
Otherwise, we advise to use our normal IDE. It is for sure that you will advance faster.
Unfortunately not. You IDE is encredibly slow, and the time I use for setting up Eclipse will deffinately be worth the wait. Also, with Eclipse we have access to all include-files and functions and have much better control over my application.