编译opencv4.2时出现undefined reference to `jpeg_default

操作系统：kylinV10
opencv版本：4.2.0

在编译opencv4.2.0的版本时，出现undefined reference to `jpeg_default_qtables’的错误提示，导致openc编译中断，不能继续编译，所以这个错误必须解决。

解决方案

查看错误的名字，根据名字分析，很有可能是当前系统中没有安装jpeg第三方库，到 http://www.ijg.org/上下载最新的源码包 jpegsrc.v9e.tar.gz,按如下顺序开始编译安装：

tar -xzvf jpegsrc.v9e.tar.gz
cd jpeg-9e./configuremake libdir=/usr/lib64 make libdir=/usr/lib64 install

执行完以上命令后，命令行最后显示显示的输出结果如下所示：

make[1]: Entering directory '/data3/deepblue/projects/build/jpeg-9e'/usr/bin/mkdir -p '/usr/lib64'/bin/sh ./libtool   --mode=install /usr/bin/install -c   libjpeg.la '/usr/lib64'
libtool: install: /usr/bin/install -c .libs/libjpeg.so.9.5.0 /usr/lib64/libjpeg.so.9.5.0
libtool: install: (cd /usr/lib64 && { ln -s -f libjpeg.so.9.5.0 libjpeg.so.9 || { rm -f libjpeg.so.9 && ln -s libjpeg.so.9.5.0 libjpeg.so.9; }; })
libtool: install: (cd /usr/lib64 && { ln -s -f libjpeg.so.9.5.0 libjpeg.so || { rm -f libjpeg.so && ln -s libjpeg.so.9.5.0 libjpeg.so; }; })
libtool: install: /usr/bin/install -c .libs/libjpeg.lai /usr/lib64/libjpeg.la
libtool: install: /usr/bin/install -c .libs/libjpeg.a /usr/lib64/libjpeg.a
libtool: install: chmod 644 /usr/lib64/libjpeg.a
libtool: install: ranlib /usr/lib64/libjpeg.a
libtool: finish: PATH="/root/.vscode-server/bin/8dfae7a5cd50421d10cd99cb873990460525a898/bin/remote-cli:/data/home/tdsql/jdk/bin:/usr/local/bin:/data/home/tdsql/jdk/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/data/home/tdsql/hadoop/bin:/data/home/tdsql/hadoop/sbin:/usr/local/cuda-11.4/bin:/root/bin:/data/home/tdsql/hadoop/bin:/data/home/tdsql/hadoop/sbin:/usr/local/cuda-11.4/bin:/root/bin:/sbin" ldconfig -n /usr/lib64
ldconfig: /usr/lib64/libLLVM-7.so is not a symbolic link----------------------------------------------------------------------
Libraries have been installed in:/usr/lib64If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the '-LLIBDIR'
flag during linking and do at least one of the following:- add LIBDIR to the 'LD_LIBRARY_PATH' environment variableduring execution- add LIBDIR to the 'LD_RUN_PATH' environment variableduring linking- use the '-Wl,-rpath -Wl,LIBDIR' linker flag- have your system administrator add LIBDIR to '/etc/ld.so.conf'See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------/usr/bin/mkdir -p '/usr/local/bin'/bin/sh ./libtool   --mode=install /usr/bin/install -c cjpeg djpeg jpegtran rdjpgcom wrjpgcom '/usr/local/bin'
libtool: install: /usr/bin/install -c .libs/cjpeg /usr/local/bin/cjpeg
libtool: install: /usr/bin/install -c .libs/djpeg /usr/local/bin/djpeg
libtool: install: /usr/bin/install -c .libs/jpegtran /usr/local/bin/jpegtran
libtool: install: /usr/bin/install -c rdjpgcom /usr/local/bin/rdjpgcom
libtool: install: /usr/bin/install -c wrjpgcom /usr/local/bin/wrjpgcom
/bin/sh /data3/deepblue/projects/build/jpeg-9e/install-sh -d /usr/local/include
/usr/bin/install -c -m 644 jconfig.h /usr/local/include/jconfig.h/usr/bin/mkdir -p '/usr/local/include'/usr/bin/install -c -m 644 jerror.h jmorecfg.h jpeglib.h '/usr/local/include'/usr/bin/mkdir -p '/usr/local/share/man/man1'/usr/bin/install -c -m 644 cjpeg.1 djpeg.1 jpegtran.1 rdjpgcom.1 wrjpgcom.1 '/usr/local/share/man/man1'/usr/bin/mkdir -p '/usr/lib64/pkgconfig'/usr/bin/install -c -m 644 libjpeg.pc '/usr/lib64/pkgconfig'
make[1]: Leaving directory '/data3/deepblue/projects/build/jpeg-9e'

说明jpeg安装成功，opencv可以继续编译了。

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编译opencv4.2时出现undefined reference to `jpeg_default_qtables‘错误的解决方案

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