1. git clone https://github.com/SWRT-dev/mtk-toolchains

2. cd mtk-toolchains

3. cd toolchain-aarch64_cortex-a53+neon-vfpv4_gcc-5.4.0_glibc-2.24/lib

4. tar xvJf libc.a.tar.xz

5. cd ../../

6. sudo ln -sf $(pwd)/buildroot-gcc463 /opt/

   sudo ln -sf $(pwd)/toolchain-aarch64_cortex-a53+neon-vfpv4_gcc-5.4.0_glibc-2.24 /opt/

   sudo ln -sf $(pwd)/lede-toolchain-mediatek-mt7629_gcc-5.4.0_musl-1.1.24_eabi.Linux-x86_64 /opt/

   sudo ln -sf $(pwd)/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.24 /opt/

   sudo ln -sf $(pwd)/toolchain-aarch64_cortex-a53_gcc-8.4.0_glibc /opt/

   sudo ln -sf $(pwd)/toolchain-aarch64_cortex-a53_gcc-8.4.0_musl /opt/