fatal error:"llvm/Pass.h"file not found

Hello,
After I finish llvm installing, I compline the pass in the path /llvm/lib/Transforms that named Hello. I use the command “clang Hello.cpp -emit-llvm -c -o Hello.bc -std=c++11”.There are errors “fatal error:”/llvm/Pass.h"file not found".
What problem is it?

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