[yocto] How to add a library header file in yocto project

[waqas shafique]

I'm trying to write a code using BlueZ API and Yocto , one C function I'm
using has deceleration defined in hci_lib.h which is located at

/poky/build/tmp/work/armv5te-poky-linux-gnueabi/bluez4/4.101-r5/bluez-4.101/lib

Can you tell me how can I include this header file in my Yocto project
recipe ?

My build process is not looking at above location and gives me undefined
reference error.

Regards
Waqas
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