Compile on device? no gcc on linux image/rootfs from buildroot

I just followed the steps here to build a new linux image:

My new linux image was successfully installed on my rk1808, but I’d like to be able to have gcc/g++ on the rk1808 to be able to compile code on the device. Is this possible? gcc is not installed by default, and I tried doing a ‘make menuconfig’ from the repo root directory, but could not find anything that would allow me to install gcc or g++.

Any ideas?