/tmp/cc4oF0nm.o: In function `tutorial::Person_PhoneType_descriptor()':
addressbook.pb.cc:(.text+0x1e): undefined reference to 
`google::protobuf::internal::AssignDescriptors(google::protobuf::internal::DescriptorTable
 
const*, bool)'

There are many similar errors when I run 
”g++ addressbook.pb.cc add_person.cc -o main `pkg-config --cflags --libs 
protobuf` 
”in ~/protobuf/examples

Here's how I installed 3.19.3: 
./configure --prefix=/usr
make -j8 make check -j8 #7 pass sudo make install 
sudo ldconfig

I have tried 2.x.x and 3.19.3, both are wrong, include ROS melodic. 
And I tried to delete all file like "/include/proto*" and "libproto*" 
except file of Anaconda and python. And then I tried to install 
again, problem was as usual :(. 
I have no idea how to fix this. 

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