OpenCL (CPU/GPU) on the Odroid N2:

# update the repos
apt update
# install git for testing code
apt install git
# outputting hardware
apt install clinfo
# get the  dev files
apt install ocl-icd-opencl-dev
# actual icd for the cpu
apt install pocl-opencl-icd
# and finally make the driver available
echo "/usr/lib/aarch64-linux-gnu/libmali.so" > /etc/OpenCL/vendors/mali.icd

Now test if the output shows Mali-G52 and pthread-cortex-a53

clinfo | grep "Device Name"

Device Name    Mali-G52
Device Name    pthread-cortex-a53