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/usr/lib/x86_64-linux-gnu/pkgconfig/protobuf.pc is in libprotobuf-dev 2.6.1-1.3.

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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: 2.6.1
Libs: -L${libdir} -lprotobuf -pthread  -lpthread
Libs.private: -lz 
Cflags: -I${includedir} -pthread
# Commented out because it crashes pkg-config *sigh*:
#   http://bugs.freedesktop.org/show_bug.cgi?id=13265
# Conflicts: protobuf-lite