Ubuntu环境下执行make -j6编译安装OpenCV时缺失webp/decode.h头文件的错误求助

你在编译OpenCV时碰到的这个错误，核心原因是系统缺少WebP格式的开发依赖库——OpenCV的imgcodecs模块需要它来处理WebP图片，编译时找不到对应的头文件就会报错。下面是具体的解决步骤：

第一步：安装WebP开发依赖 #

打开终端，执行以下命令安装WebP的开发包：

sudo apt-get update && sudo apt-get install libwebp-dev

第二步：重新配置并编译OpenCV #

回到你之前创建的OpenCV build目录，重新运行CMake配置（如果你之前已经配置过，这一步会自动检测到新安装的依赖）：

cd /path/to/your/opencv/build
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..

配置完成后，重新执行编译命令：

make -j$(nproc)

这里用$(nproc)可以自动匹配你的CPU核心数，比手动写-j6更适配不同的硬件。

附：你遇到的错误日志 #

Consolidate compiler generated dependencies of target ittnotify
[ 28%] Built target ittnotify
Consolidate compiler generated dependencies of target IlmImf
Consolidate compiler generated dependencies of target libprotobuf
Consolidate compiler generated dependencies of target opencv_core
[ 28%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/system.cpp.o
[ 28%] Built target IlmImf
[ 28%] Built target libprotobuf
[ 28%] Linking CXX shared library ../../lib/libopencv_core.so
[ 28%] Built target opencv_core
Consolidate compiler generated dependencies of target opencv_flann
[ 28%] Linking CXX shared library ../../lib/libopencv_flann.so
Consolidate compiler generated dependencies of target opencv_ml
[ 28%] Linking CXX shared library ../../lib/libopencv_ml.so
Consolidate compiler generated dependencies of target opencv_imgproc
[ 28%] Linking CXX shared library ../../lib/libopencv_imgproc.so
[ 28%] Built target opencv_flann
[ 28%] Built target opencv_ml
[ 28%] Built target opencv_imgproc
Consolidate compiler generated dependencies of target opencv_objdetect
[ 28%] Linking CXX shared library ../../lib/libopencv_objdetect.so
Consolidate compiler generated dependencies of target opencv_video
[ 28%] Linking CXX shared library ../../lib/libopencv_video.so
Consolidate compiler generated dependencies of target opencv_photo
Consolidate compiler generated dependencies of target opencv_imgcodecs
[ 28%] Linking CXX shared library ../../lib/libopencv_photo.so
Consolidate compiler generated dependencies of target opencv_dnn
[ 28%] Building CXX object modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/src/grfmt_webp.cpp.o
[ 28%] Building CXX object modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/src/rgbe.cpp.o
[ 28%] Linking CXX shared library ../../lib/libopencv_dnn.so
/home/user/opencv/modules/imgcodecs/src/grfmt_webp.cpp:47:10: fatal error: webp/decode.h: No such file or directory
#include <webp/decode.h>
^~~~~~~~~~~~~~~
compilation terminated.
modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/build.make:285: recipe for target 'modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/src/grfmt_webp.cpp.o' failed
make[2]: *** [modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/src/grfmt_webp.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
[ 28%] Built target opencv_video
[ 28%] Built target opencv_objdetect
Consolidate compiler generated dependencies of target opencv_shape
[ 28%] Linking CXX shared library ../../lib/libopencv_shape.so
[ 28%] Built target opencv_photo
[ 28%] Built target opencv_shape
CMakeFiles/Makefile2:2256: recipe for target 'modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all' failed
make[1]: *** [modules/imgcodecs/CMakeFiles/opencv_imgcodecs.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 28%] Built target opencv_dnn
Makefile:165: recipe for target 'all' failed
make: *** [all] Error 2

内容的提问来源于stack exchange，提问作者hosna