A question when building the sibr_viewers

I have config and generate the sibr_viewers. but I am failed when building the sibr_viewers. What is lembree? The log is shown as follow: [main] 正在生成文件夹: /media/yanggang/847C02507C023D84/cpp/SIBR_viewers/build [build] 正在启动生成 [proc] 正在执行命令: /usr/local/bin/cmake --build /media/yanggang/847C02507C023D84/cpp/SIBR_viewers/build --config Debug --target all -j 32 -- [build] [ 0%] Built target sibr_graphics_resources [build] [ 2%] Built target mrf [build] [ 6%] Built target SIBR_texturedMesh_app_resources [build] [ 6%] Built target xatlas [build] [ 8%] Built target imgui [build] [ 8%] Built target sibr_gaussian_shaders [build] [ 11%] Built target CudaRasterizer [build] [ 13%] Built target nativefiledialog [build] [ 23%] Built target sibr_system [build] [ 23%] Built target sibr_renderer_shaders [build] [ 23%] Built target sibr_view_shaders [build] [ 23%] Built target PREBUILD [build] [ 35%] Built target sibr_graphics [build] [ 39%] Built target sibr_video [build] [ 44%] Built target sibr_assets [build] [ 44%] Linking CXX shared library libsibr_raycaster_d.so [build] /usr/bin/ld: 找不到 -lembree [build] collect2: error: ld returned 1 exit status [build] make[2]: *** [src/core/raycaster/CMakeFiles/sibr_raycaster.dir/build.make:240：src/core/raycaster/libsibr_raycaster_d.so] 错误 1 [build] make[1]: *** [CMakeFiles/Makefile2:1054：src/core/raycaster/CMakeFiles/sibr_raycaster.dir/all] 错误 2 [build] make: *** [Makefile:136：all] 错误 2 [proc] 命令“/usr/local/bin/cmake --build /media/yanggang/847C02507C023D84/cpp/SIBR_viewers/build --config Debug --target all -j 32 --”已退出，代码为 2 [driver] 生成完毕: 00:00:00.880 [build] 生成已完成，退出代码为 2