cmake option to download raylib

CMakeLists.txt

@@ -5,8 +5,28 @@ project(kubo LANGUAGES C)
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(RAYLIB_VERSION 5.5)
-find_package(raylib ${RAYLIB_VERSION} REQUIRED)
+option(USE_SYSTEM_RAYLIB "Use system-installed raylib instead of downloading" OFF)
+
+if(USE_SYSTEM_RAYLIB)
+    set(RAYLIB_VERSION 5.5)
+    find_package(raylib ${RAYLIB_VERSION} REQUIRED)
+else()
+    include(FetchContent)
+    set(FETCHCONTENT_QUIET FALSE)
+    set(BUILD_EXAMPLES OFF CACHE BOOL "" FORCE) # don't build the supplied examples
+    set(BUILD_GAMES    OFF CACHE BOOL "" FORCE) # don't build the supplied example games
+    set(GLFW_BUILD_WAYLAND "Build the bundled GLFW with Wayland support" ON)
+    set(GLFW_BUILD_X11 "Build the bundled GLFW with X11 support" ON)
+
+    FetchContent_Declare(
+        raylib
+        GIT_REPOSITORY "https://github.com/raysan5/raylib.git"
+        GIT_TAG "master"
+        GIT_PROGRESS TRUE
+    )
+
+    FetchContent_MakeAvailable(raylib)
+endif()
 
 set(SOURCES
     kubo_command.c