1、.build_release/lib/libcaffe.so：对‘gflags::ParseCommandLineFlags(int*, char***, bool)’未定义的引用
解决：
这里继续安装gflags： https://github.com/schuhschuh/gflags/archive/master.zip下载。解压
cd gflags-master mkdir build && cd build export CXXFLAGS="-fPIC" && cmake .. && make VERBOSE=1 make sudo make install2、nvcc warning : The 'compute_20', 'sm_20', and 'sm_21' architectures are deprecated, and may be removed in a future release (Use -Wno-deprecated-gpu-targets to suppress warning).解决：原因是，Makefile中采用了CUDA的compute capability 2.0和2.1，这是两种计算能力。安装的CUDA版本是8.0，但 从CUDA 8.0开始compute capability 2.0和2.1被弃用了，所以可以将Makefile.config中的-gencode arch=compute_20,code=sm_20 和-gencode arch=compute_20,code=sm_21这两行删除即可。
3、/usr/bin/ld: 找不到 -lopenblas
解决：
首先查看是否安装libopenblas-base 和libopenblas-dev，如果未安装，则命令sudo apt-get install libopenblas-base libopenblas-dev后再次编译，仍有错误查看以下解决方式。
I faced the same problem. Even adding library directory "/opt/OpenBLAS/lib/" to ldconfig cache didn't help (as my libopenblas.so is at "/opt/OpenBLAS/lib/libopenblas.so").
Using cmake helped me. Try this from caffe root directory:
mkdir buildcd buildcmake -DBLAS=open ..make allmake runtest
If you need to use make, add the symlink of libopenblas.so to /usr/lib. I did the following:
ln -s /opt/OpenBLAS/lib/libopenblas.so /usr/lib/libopenblas.so
解决网址：https://stackoverflow.com/questions/32353509/usr-bin-ld-cannot-find-lopenblas-error-in-caffe-compilation
4、test_data_transformer.cpp(.text._ZN5caffe11MakeTempDirEPSs[_ZN5caffe11MakeTempDirEPSs]+0x4a)：‘boost::filesystem::detail::temp_directory_path(boost::system::error_code*)’未定义的引用。
解决：按照赵永科《21天实战caffe》第38页安装Boost，如果安装完成后还是出现此类信息，查看caffe目录下Makefile文件里LIBRARIES内容的正确与否，楼主在调试前面的bug时错误把这里改动了，不能缺少boost-system和boost-filesystem。如下：
原来的：#LIBRARIES += glog gflags protobuf boost_system boost_filesystem m hdf5_hl hdf5 现在的：LIBRARIES += glog gflags protobuf leveldb snappy lmdb boost_system boost_filesystem hdf5_hl hdf5 m opencv_core opencv_highgui opencv_imgproc opencv_imgcodecs openblas
5、.build_release/tools/caffe: error while loading shared libraries: libopenblas.so.0: cannot open shared object file: No such file or directory make: *** [runtest] 错误 127
解决：sudo apt-get install libopenblas-dev
