Not able to add external library using git submodules in CMake - c++

Question

I am trying to add jwt-cpp library by Thalhammer in my project using CMake.
My project structure is as follows
build
External
---- jwt
.gitignore
.gitmodules
CMakeLists.txt
main.cpp
I used command git submodule add https://github.com/Thalhammer/jwt-cpp.git External/jwt to add the mentioned git submodule to my project. and the contents of the .gitmodules file is
[submodule "External/jwt"]
path = External/jwt
url = https://github.com/Thalhammer/jwt-cpp.git
My CMakeLists.txt looks like
cmake_minimum_required(VERSION 3.24.2)
set(This Trial)
project(${This} C CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
set(Sources main.cpp)
add_executable(${This} ${Sources})
add_subdirectory(External/jwt)
if(NOT TARGET jwt-cpp)
find_package(jwt-cpp CONFIG REQUIRED)
endif()
target_include_directories(${This} INTERFACE External/jwt/include)
target_link_libraries(${This} INTERFACE jwt-cpp::jwt-cpp)
and my main.cpp is
#include <iostream>
#include <jwt-cpp/jwt.h>
int main ()
{
return 0;
}
The issue I am facing is that everything configures builds properly if is don't include #include <jwt-cpp/jwt.h> in my main.cpp file but throws and error if I do that. The error looks like as follows:
fatal error: 'jwt-cpp/jwt.h' file not found
#include <jwt-cpp/jwt.h>
^~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [CMakeFiles/Trial.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Trial.dir/all] Error 2
make: *** [all] Error 2
I am not able to figure out what should I correct/edit.

Answer 1

The INTERFACE property adds folders for dependent targets. You need to use the PUBLIC property so that folders are added to the target to be builded.