https://blog.csdn.net/u010518385/article/details/116701542
按照这个链接安装ncnn，在这之前的git submodule update --init时就有一些问题，make -j4时卡在93%
[ 93%] Linking CXX executable rvm
[ 93%] Linking CXX executable yolov4
[ 93%] Linking CXX executable p2pnet
/usr/bin/ld: ../src/libncnn.a(cpu.cpp.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'
/usr/bin/ld: //lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [benchmark/CMakeFiles/benchncnn.dir/build.make:94: benchmark/benchncnn] Error 1
make[1]: *** [CMakeFiles/Makefile2:651: benchmark/CMakeFiles/benchncnn.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/usr/bin/ld: ../src/libncnn.a(cpu.cpp.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'
/usr/bin/ld: //lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/yolov4.dir/build.make:99: examples/yolov4] Error 1
make[1]: *** [CMakeFiles/Makefile2:750: examples/CMakeFiles/yolov4.dir/all] Error 2
/usr/bin/ld: ../src/libncnn.a(cpu.cpp.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'
/usr/bin/ld: //lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/rvm.dir/build.make:99: examples/rvm] Error 1
make[1]: *** [CMakeFiles/Makefile2:717: examples/CMakeFiles/rvm.dir/all] Error 2
/usr/bin/ld: ../src/libncnn.a(cpu.cpp.o): undefined reference to symbol 'dlopen@@GLIBC_2.4'
/usr/bin/ld: //lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[2]: *** [examples/CMakeFiles/p2pnet.dir/build.make:99: examples/p2pnet] Error 1
make[1]: *** [CMakeFiles/Makefile2:684: examples/CMakeFiles/p2pnet.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
```-
重新下载了几次了，都是这个样子，系统也重装过，不过没有啥用啊，求大神帮帮我！！
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要么 cmake 的时候把 `NCNN_VULKAN=ON 改为 OFF，要么安装上 Vulkan，推荐链接https://xfxuezhang.blog.csdn.net/article/details/121695743。应该就能解决了