Include header files in out of tree driver developement

Hi,

I tried the following ticket for out of tree developement ( Out-of-tree driver - Zephyr (freestanding app) )

It works,but i cannot able to access the header files of my driver from application, even from driver c files if placed in app/include/drivers... directory as mentioned in that ticket

I have also explained my case elaborately as a reply in that ticket,

i tried the following line in cmakelist.txt

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list(APPEND SYSCALL_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/include)
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this also throws the error

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fatal error: app/drivers/modem/modem_test.h: No such file or directory
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is there any other cmake argument that should be included to access the header file???