build error

[ToSeven]

[LdB-ECM]

You are building to a linux target compiler the name tells you that ... aarch64-linux-gnu-gcc

You will need to work out how to flag off the linux library from the compiler or simply download the right "none-elf" version for baremetal for your OS
Read the descriptions carefully
https://releases.linaro.org/archive/14.11/components/toolchain/binaries/

So something like aarch64-none-elf I am guessing is what you need as it says
Linux 64-bit binaries for the Aarch64 bare-metal cross-toolchain