编译pycaffe错误 --#error This file was generated by a newer version of protoc

在编译py-faster-rcnn的pycaffe时出现以上错误：

CXX .build_release/src/caffe/proto/caffe.pb.ccCXX src/caffe/blob.cppCXX src/caffe/data_transformer.cppCXX src/caffe/net.cppCXX src/caffe/solver.cppCXX src/caffe/util/insert_splits.cppCXX src/caffe/util/db.cppCXX src/caffe/util/upgrade_proto.cppIn file included from .build_release/src/caffe/proto/caffe.pb.cc:5:0:.build_release/src/caffe/proto/caffe.pb.h:12:2: error: #error This file was generated by a newer version of protoc which is #error This file was generated by a newer version of protoc which is  ^.build_release/src/caffe/proto/caffe.pb.h:13:2: error: #error incompatible with your Protocol Buffer headers. Please update #error incompatible with your Protocol Buffer headers.  Please update  ^.build_release/src/caffe/proto/caffe.pb.h:14:2: error: #error your headers. #error your headers.  ^.build_release/src/caffe/proto/caffe.pb.h:22:35: fatal error: google/protobuf/arena.h: 没有那个文件或目录 #include <google/protobuf/arena.h>                                   ^compilation terminated.

原因： it is because of the wrong version of protobuf
首先你要卸载，并重装其要求的protobuf版本（2.6.1），之后重新编译就好了

卸载办法：

#removesudo apt-get remove libprotobuf-dev protobuf-compilersudo apt-get remove libprotobuf-lite8 libprotoc8sudo apt-get remove python-protobufsudo pip uninstall protobuf#如果安装了anacondaconda uninstall protobuf

如果出现错误：

E:Encountered a section with no Package: header,

输入以下命令：

sudo rm /var/lib/apt/lists/* -vfsudo apt-get update

重新安装

#reinstallsudo apt-get install libprotobuf-dev protobuf-compiler#if anacondaconda install -c anaconda protobuf=2.6.1或者/home/username/anaconda2/bin/pip install protobuf == 2.6.1

附注：

查看当前protoc版本：protoc --version

查看protoc安装位置：which protoc

查找protoc相关文件：sudo find / -name protoc

手动安装protobuf 2.6.1方法：

http://www.cnblogs.com/javaee6/p/4849051.html