CMake/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt

add_library(MathFunctions mysqrt.cxx)

# state that anybody linking to us needs to include the current source dir
# to find MathFunctions.h, while we don't.
# state that we depend on Tutorial_BINARY_DIR but consumers don't, as the
# TutorialConfig.h include is an implementation detail
target_include_directories(MathFunctions
          INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
          PRIVATE ${Tutorial_BINARY_DIR}
          )

# install rules
install(TARGETS MathFunctions DESTINATION lib)
install(FILES MathFunctions.h DESTINATION include)