Make Error at /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146 (message): Could NOT find SDL (missing: SDL_LIBRARY SDL_INCLUDE_DIR) Call Stack (most recent call first): /usr/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393 (_FPHSA_FAILURE_MESSAGE) /usr/share/cmake-3.16/Modules/FindSDL.cmake:188 (FIND_PACKAGE_HANDLE_STANDARD_ARGS) navigation-noetic-devel/map_server/CMakeLists.txt:12 (find_package) -- Configuring incomplete, errors occurred! See also "/home/a728689213/new_workspace/build/CMakeFiles/CMakeOutput.log". See also "/home/a728689213/new_workspace/build/CMakeFiles/CMakeError.log". make: *** [Makefile:320: cmake_check_build_system] Error 1

这个错误是因为 CMake 找不到 SDL 库，可能是因为你的系统没有安装 SDL 库，或者 CMake 没有正确配置 SDL 库的路径。你可以尝试使用包管理器安装 SDL 库，比如在 Ubuntu 上，你可以使用以下命令安装：

sudo apt-get install libsdl2-dev

如果已经安装了 SDL 库，你可以查看一下 CMakeLists.txt 中关于 SDL 库的配置是否正确，比如确保已经设置了 SDL_LIBRARY 和 SDL_INCLUDE_DIR 变量的值。