./include/caffe/common.hpp:5:27: fatal error: gflags/gflags.h: No such file or directory

If you get this error when you run make all for caffe. It is possible that you are missing dependencies. To install missing gflag dependencies 

wget https://github.com/schuhschuh/gflags/archive/master.zip
unzip master.zip
cd gflags-master
mkdir build && cd build
export CXXFLAGS="-fPIC" && cmake .. && make VERBOSE=1
make 
sudo make install