The ESPRESSObin board uses the Linaro toolchain for building binary kernel and file system images, so make sure to set it up first before building other components.
Begin by making a directory (in e.g. /home/user/toolchain) where the Linaro toolchain will be downloaded:
$ mkdir -p toolchain && cd toolchain
The Linaro toolchain can be downloaded from the link below:
It can also be obtained via command line:
$ wget https://releases.linaro.org/components/toolchain/binaries/5.2-2015.11-2/aarch64-linux-gnu/gcc-linaro-5.2-2015.11-2-x86_64_aarch64-linux-gnu.tar.xz
Once the toolchain is downloaded, extract the archive with:
$ tar -xvf gcc-linaro-5.2-2015.11-2-x86_64_aarch64-linux-gnu.tar.xz
Lastly, set the correct path for the toolchain (compiler path including bin directory):
$ export PATH=$PATH:/home/espressobin/toolchain/gcc-linaro-5.2-2015.11-2-x86_64_aarch64-linux-gnu/bin
Note
Be sure to replace the path above to where you downloaded the toolchain.