run imgui demo

CMakeLists.txt

@@ -4,6 +4,7 @@ project(kge)
 
 find_package(SDL2 REQUIRED)
 find_package(OpenGL REQUIRED)
+find_package(Freetype REQUIRED)
 
 add_compile_options("-Wall" "-Wextra" "-Werror")
 add_definitions(-DIMGUI_ENABLE_FREETYPE)
@@ -20,17 +21,24 @@ add_library(imgui STATIC
         ext/imgui/backends/imgui_impl_sdl2.cpp
         ext/imgui/backends/imgui_impl_sdl2.h
         ext/imgui/backends/imgui_impl_opengl3.cpp
-        ext/imgui/backends/imgui_impl_opengl3.h)
+        ext/imgui/backends/imgui_impl_opengl3.h
+
+	ext/imgui/misc/freetype/imgui_freetype.cpp
+	ext/imgui/misc/freetype/imgui_freetype.h
+)
 add_library(imgui::imgui ALIAS imgui)
 target_link_libraries(imgui
     PUBLIC
     OpenGL::GL
     $<TARGET_NAME_IF_EXISTS:SDL2::SDL2main>
     $<IF:$<TARGET_EXISTS:SDL2::SDL2>,SDL2::SDL2,SDL2::SDL2-static>
+    Freetype::Freetype
 )
 target_include_directories(imgui PUBLIC
 	ext/imgui/
 	ext/imgui/backends/
+	ext/imgui/misc/freetype
+	${FREETYPE_INCLUDE_DIRS}
 )
 
 include_directories(ext/)