[已解决]/usr/lib/libgflags.so.2.2: error adding symbols: DSO missing from command line

问题描述
在编译安装ceres库时，遇到以下问题

/usr/bin/ld: warning: libgflags.so.2.2, needed by /usr/local/lib/libglog.so, may conflict with libgflags.so.2
/usr/bin/ld: warning: libgflags.so.2.2, needed by /usr/local/lib/libglog.so, may conflict with libgflags.so.2
/usr/bin/ld: CMakeFiles/denoising.dir/denoising.cc.o: undefined reference to symbol '_ZN6google15SetUsageMessageERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE'
//usr/lib/libgflags.so.2.2: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
examples/CMakeFiles/denoising.dir/build.make:118: recipe for target 'bin/denoising' failed
make[2]: *** [bin/denoising] Error 1
CMakeFiles/Makefile2:3670: recipe for target 'examples/CMakeFiles/denoising.dir/all' failed
make[1]: *** [examples/CMakeFiles/denoising.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

折腾了一下午都没解决
尝试更换ceres版本，把libgflags.so.2.2复制到/usr/local/lib下和/usr/lib下，都没解决，更换源卸载libflags，重新安装libflags还是不行，后来发现，用源码安装gflags就可以顺利解决问题！！
gflags的安装教程
https://github.com/gflags/gflags/blob/master/INSTALL.md