How to do it

Let us look in detail at the various files needed by CMake:

  1. The top-level CMakeLists.txt contains the following:
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)  project(recipe-08 LANGUAGES CXX)set(CMAKE_CXX_STANDARD 11)set(CMAKE_CXX_EXTENSIONS OFF)set(CMAKE_CXX_STANDARD_REQUIRED ON)
include(GNUInstallDirs)set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})set(CMAKE_LIBRARY_OUTPUT_DIRECTORY  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})set(CMAKE_RUNTIME_OUTPUT_DIRECTORY  ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})# defines targets and sourcesinclude(src/CMakeLists.txt)include(external/CMakeLists.txt)enable_testing()add_subdirectory(tests)
  1. The external/CMakeLists.txt file is unchanged compared to the ...

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