This is designed for the GNU-x86_64-Linux system, the same one as EdStem.
you can download out.zip or build it yourself from make clean package.
Drag the zip file to the EdStem workspace. it should extract itself.
Every time you need to run/test a program, you should do:
source begin.sh #to extract avr-gcc and other libraries
make #to compile changes in the source code
python3 tester.py #to run tests.