I could not build the arm64 gcc toolchain

I could not build the arm64 gcc toolchain.The infomation is as follows:

root@ubuntu:/opt/linaro/toolchain-build-aarch64# sh make-aarch64-toolchain.sh
Downloading sources
Applying patches

Where is the script and tool chain source downloaded from? What are your tool chain requirements (including whether target includes kernel, user space, boot loader)?

I solved the problem!I use the compiled tool chain instead of building it by myself!