I am trying to build RT-Thread from the Raspberry Pi 4 64bit Board Support Package:
Derrick@DESKTOP-GGC7P0I C:\Derrick\GitHub\RT-Thread\rt-thread_Mine\bsp\raspberry-pi\raspi4-64 > scons scons: Reading SConscript files ... Error: the toolchain path (/opt/gcc-arm-8.3-2019.03-x86_64-aarch64-elf/bin/) is not exist, please check 'EXEC_PATH' in path or rtconfig.py.
Why am I getting that error? What is scons looking for in that directory? Where can I download that toolchain for the Raspberry Pi 4?