message: Add -lrt flag to support building on CentOS 6.
diff: @@ -45,4 +45,5 @@ tensorflow/contrib/makefile/compile_linux_protobuf.sh
  make -j"${JOB_COUNT}" -f tensorflow/contrib/makefile/Makefile \
  OPTFLAGS="-O3 -march=native" \
  HOST_CXXFLAGS="--std=c++11 -march=native" \
  + ADD_CFLAGS=-lrt \
  MAKEFILE_DIR=$SCRIPT_DIR
  