编译错误：../libs/libvideo_pipe.so: undefined reference to `cv::freetype::createFreeType2()'

[MnMainTou]

使用make -j4命令后，报错

[ 71%] Linking CXX executable ../bin/multi_detectors_sample
[ 71%] Linking CXX executable ../bin/firesmoke_detect_sample
../libs/libvideo_pipe.so: undefined reference to `cv::freetype::createFreeType2()'
collect2: error: ld returned 1 exit status
samples/CMakeFiles/multi_detectors_sample.dir/build.make:111: recipe for target 'bin/multi_detectors_sample' failed
make[2]: *** [bin/multi_detectors_sample] Error 1
CMakeFiles/Makefile2:383: recipe for target 'samples/CMakeFiles/multi_detectors_sample.dir/all' failed
make[1]: *** [samples/CMakeFiles/multi_detectors_sample.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
../libs/libvideo_pipe.so: undefined reference to `cv::freetype::createFreeType2()'
collect2: error: ld returned 1 exit status
samples/CMakeFiles/lane_detect_sample.dir/build.make:111: recipe for target 'bin/lane_detect_sample' failed
make[2]: *** [bin/lane_detect_sample] Error 1
CMakeFiles/Makefile2:269: recipe for target 'samples/CMakeFiles/lane_detect_sample.dir/all' failed
make[1]: *** [samples/CMakeFiles/lane_detect_sample.dir/all] Error 2
../libs/libvideo_pipe.so: undefined reference to `cv::freetype::createFreeType2()'
collect2: error: ld returned 1 exit status
samples/CMakeFiles/face_swap_sample.dir/build.make:111: recipe for target 'bin/face_swap_sample' failed
make[2]: *** [bin/face_swap_sample] Error 1
CMakeFiles/Makefile2:307: recipe for target 'samples/CMakeFiles/face_swap_sample.dir/all' failed
make[1]: *** [samples/CMakeFiles/face_swap_sample.dir/all] Error 2
../libs/libvideo_pipe.so: undefined reference to `cv::freetype::createFreeType2()'
collect2: error: ld returned 1 exit status
samples/CMakeFiles/firesmoke_detect_sample.dir/build.make:111: recipe for target 'bin/firesmoke_detect_sample' failed
make[2]: *** [bin/firesmoke_detect_sample] Error 1
CMakeFiles/Makefile2:345: recipe for target 'samples/CMakeFiles/firesmoke_detect_sample.dir/all' failed
make[1]: *** [samples/CMakeFiles/firesmoke_detect_sample.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

环境 系统：Ubuntu 18.04.6 LTS openCV:4.6.0

[sherlockchou86]

参考： https://github.com/sherlockchou86/VideoPipe/issues/40#issuecomment-2069606083