The env_install_toolchain.sh is a shell script to install this toolchain.

We can use
    source ./env_install_toolchain.sh /opt/toolchain
command line to install toolchain in /opt/toolchain.

Or we can use
    source ./env_install_toolchain.sh dirname
command line to install toolchain in the "dirname" which you Specified.

For now, we can use toolchain in everywhere.