Exclude SFML from the ALL build, which stops it being installed along…

…side the project

CMakeLists.txt

@@ -5,10 +5,13 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 option(BUILD_SHARED_LIBS "Build shared libraries" OFF)
 
 include(FetchContent)
-FetchContent_Declare(SFML
+FetchContent_Declare(sfml
     GIT_REPOSITORY https://github.com/SFML/SFML.git
     GIT_TAG 2.6.x)
-FetchContent_MakeAvailable(SFML)
+if (NOT sfml_POPULATED)
+    FetchContent_Populate(sfml)
+    add_subdirectory(${sfml_SOURCE_DIR} ${sfml_BINARY_DIR} EXCLUDE_FROM_ALL)
+endif()
 
 add_executable(CMakeSFMLProject src/main.cpp)
 target_link_libraries(CMakeSFMLProject PRIVATE sfml-graphics)