[CMake] search include path from find_path failure

[hce]

Hi,

I am running 2.8.8 on Linux. I have a library already been set up in
environment, I can see it in both LD_LIBRARY_PATH and $PATH, but when I was
compiling another source code which calling find_path() to check the library
package include path, it failed. In general, how the cmake find_path() to
find include path works? Is there any equivalent Linux shell command I can
use to check to the library's include path?

Thank you.

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