Could NOT find protobuf (missing: protobuf_DIR)

[alexuechao]

detail | 详细描述 | 詳細な説明

-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE
-- OpenCV library: /usr
-- version: 4.2.0
-- libraries: opencv_core;opencv_highgui;opencv_imgproc;opencv_imgcodecs;opencv_videoio
-- include path: /usr/include/opencv4
-- Could NOT find protobuf (missing: protobuf_DIR)
-- Found Protobuf: /usr/local/lib/libprotobuf.so;-pthread (found version "3.20.0")
-- Could NOT find protobuf (missing: protobuf_DIR)
-- Configuring done
-- Generating done

when I cmake .. ， meet this error ,Could NOT find protobuf (missing: protobuf_DIR)

[nihui]

the build system will try looking for protobuf with protobuf_DIR first, then the system-wide protobuf
the error message is expected

[alexuechao]

It means I can directly run make without worrying about this error？ thanks