how to create a specific target with cmake (cpprest-sdk)

Based on this question CMake cpprestsdk I tried to create a specific target from cpprestsdk source code. First, I cloned the github project into /home/user/git/cpprestsdk

Then, I created the CmakeLists.txt file

project(ProjectName)
find_package(cpprestsdk CONFIG REQUIRED) 
target_link_libraries(ProjectName PRIVATE cpprestsdk::cpprestsdk_boost_internal)

and the cmake command:

cmake -DCMAKE_PREFIX_PATH=/home/user/git/cpprestsdk/Release/src .

and got the following error:

CMake Error at cpprestsdk/Release/src/cpprestsdk-config.cmake:25 (include):
  include could not find load file:

    /home/ebalbar/git/cpprestsdk/Release/src/cpprestsdk-targets.cmake
Call Stack (most recent call first):
  CMakeLists.txt:2 (find_package)


CMake Error at CMakeLists.txt:3 (target_link_libraries):
  Cannot specify link libraries for target "ProjectName" which is not built
  by this project.

The target file can be found under /home/user/git/cpprestsdk/Release/src/CMakeFiles/Export/lib/cmake/cpprestsdk/cpprestsdk-targets.cmake

So the question is how to build cpprestsdk::cpprestsdk_boost_internal target?

Thanks in advance!

Solution

as @Tsyvarev pointed out first the library should be built and installed.

cmake .
cmake --build .
cmake --install . --prefix <install_folder>

Then, the application CMakeList.txt should look like this:

cmake_minimum_required(VERSION 3.16)
# In your project's CMakeLists.txt
project(ProjectName)
set(CMAKE_PREFIX_PATH "<install_folder>")

find_package(cpprestsdk REQUIRED)
add_library(my_target SHARED main.cpp)
# Link to `cpprestsdk::cpprestsdk_openssl_internal` in your target
target_link_libraries(my_target cpprestsdk::cpprestsdk_openssl_internal)

then I could build the application with the following cmake commands:

cmake .
cmake --build .