我正在尝试为我的当前类创建一个使用ImGUI + SDL + SDLRenderer + OpenCv的CmakeLists.txt。

.
├── CMakeLists.txt
├── imgui
│   ├── imconfig.h
│   ├── imgui.cpp
│   ├── imgui_demo.cpp
│   ├── imgui_draw.cpp
│   ├── imgui.h
│   ├── imgui_impl_sdl.cpp
│   ├── imgui_impl_sdl.h
│   ├── imgui_impl_sdlrenderer.cpp
│   ├── imgui_impl_sdlrenderer.h
│   ├── imgui_internal.h
│   ├── imgui_tables.cpp
│   ├── imgui_widgets.cpp
│   ├── imstb_rectpack.h
│   ├── imstb_textedit.h
│   ├── imstb_truetype.h
│   └── LICENSE.txt
├── main.cpp
├── Makefile
└── testImages
    └── test001.png

我当前CMakeLists

project(main)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE INTERNAL "")
set(sources
    imgui/imconfig.h
    imgui/imgui.cpp
    imgui/imgui.h
    imgui/imgui_demo.cpp
    imgui/imgui_draw.cpp
    imgui/imgui_internal.h
    imgui/imgui_widgets.cpp
    imgui/imstb_rectpack.h
    imgui/imstb_textedit.h
    imgui/imstb_truetype.h
    imgui/imgui_impl_sdlrenderer.cpp
    imgui/imgui_impl_sdlrenderer.h
    imgui/imgui_impl_sdl.cpp
    imgui/imgui_impl_sdl.h
)
find_package(SDL2 REQUIRED)
include_directories(${SDL2_INCLUDE_DIRS})
find_package( OpenCV REQUIRED )
add_executable( main main.cpp ${sources} )
target_link_libraries( main ${OpenCV_LIBS} ${SDL2_LIBRARIES} )

但我得到了所有ImGUI函数的未定义引用：

[ 12%] Linking CXX executable main
/usr/bin/ld: CMakeFiles/main.dir/imgui/imgui.cpp.o: in function `ImGuiListClipper_SeekCursorAndSetupPrevLine(float, float)':
imgui.cpp:(.text+0x60c6): undefined reference to `ImGui::TableEndRow(ImGuiTable*)'
/usr/bin/ld: CMakeFiles/main.dir/imgui/imgui.cpp.o: in function `ImGuiListClipper::Begin(int, float)':
imgui.cpp:(.text+0x62a3): undefined reference to `ImGui::TableEndRow(ImGuiTable*)'
/usr/bin/ld: CMakeFiles/main.dir/imgui/imgui.cpp.o: in function `ImGuiListClipper_StepInternal(ImGuiListClipper*)':
imgui.cpp:(.text+0x66d3): undefined reference to `ImGui::TableEndRow(ImGuiTable*)'
[...]

目前我只想在linux中构建这个，所以我可以考虑以后的windows/ mac版本。
我做错了什么？