#include<cilk/cilk.h> not found

Hey everyone after installing cilkplus. I try to compile a simple program of Fibonacci. But there is an error which says that "#include<cilk/cilk.h>" not found.
the cilkplus runtime library file libcilkrts is not there which contains the cilk.h header file.
Can anyone help me to add the library file libcilkrts with LLCM/Clang.
Thank you.

[azhang7]

What OS are you running, and what is the exact command and error you are seeing?

Have you set up the compiler's include paths (see the "Using" section on cilkplus.github.io)?