You can try running the command with sudo to grant the necessary permissions:

sudo ln -s /path/to/source /usr/local/bin/fvm

You’ll be prompted to enter your password. If you still face issues, make sure your user has the appropriate permissions for the /usr/local/bin directory. You can check and modify permissions using:

sudo chown $(whoami) /usr/local/bin

Let me know if this helps or if you need further assistance!