CMakeLists.txt

include(FetchContent)

set(SFML_VERSION 2.5.1)
set(IMGUI_VERSION 1.87)
# set(IMGUI_SFML_VERSION 2.3)

# It's nice to get stripped-down release zips instead of cloning
# a repo and checking out a tag
FetchContent_Declare(
  SFML
  URL "/~https://github.com/SFML/SFML/archive/${SFML_VERSION}.zip"
)

FetchContent_Declare(
  imgui
  URL "/~https://github.com/ocornut/imgui/archive/v${IMGUI_VERSION}.zip"
)

# Or by tag...
FetchContent_Declare(
  imgui-sfml
  GIT_REPOSITORY /~https://github.com/SFML/imgui-sfml.git
  GIT_TAG        2.6.x
  # GIT_COMMIT 5f54b69b6aee18db846c81633f86f78c2586dded
  # ^ or like this - sometimes it's better because FetchContent won't look
  # into remote to see if branch head was updated or not - good for stable
  # tags like 'vX.X' corresponding to releases
)

## finally, let's build

# SFML
option(SFML_BUILD_AUDIO "Build audio" OFF)
option(SFML_BUILD_NETWORK "Build network" OFF)
FetchContent_MakeAvailable(sfml)

# Dear ImGui
FetchContent_MakeAvailable(imgui)

# ImGui-SFML
set(IMGUI_DIR ${imgui_SOURCE_DIR})
option(IMGUI_SFML_FIND_SFML "Use find_package to find SFML" OFF)
option(IMGUI_SFML_IMGUI_DEMO "Build imgui_demo.cpp" ON)

FetchContent_MakeAvailable(imgui-sfml)