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/usr/lib/x86_64-linux-gnu/pkgconfig/protobuf.pc is in libprotobuf-dev 3.0.0-9.1ubuntu1.

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prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include

Name: Protocol Buffers
Description: Google's Data Interchange Format
Version: 3.0.0
Libs: -L${libdir} -lprotobuf -pthread  -lpthread
Libs.private: -lz 
Cflags: -I${includedir} -pthread
Conflicts: protobuf-lite