trying to run a SYCL vector add code on ubuntu

I am a newbie in SYCL development. I just downloaded a repository from github for vector addition and I am trying to run the code on my linux machine.
Can somebody please help me compile and run this code. I want to run it on my CPU.

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I tried to do :
g++ vector_add.cpp
But it gives me an error stating that CL/sycl.hpp not found.