GCC requirements not mentioned in user_guide.rst
When attempting to build TF-A following user_guide.rst if I try to run
./build-scripts/build-arm-tf.sh -f uefi build
I get errors such as
make: /home/broonie/src/fvp-ref/tools/gcc/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc: No such file or directory
I would have expected the repo sync step to have obtained this for me, there is no mention in the document I can see that any step is required to install this toolchain (and indeed it is very surprising that we would recommend or require a toolchain more than five years old!).