/usr/lib/x86_64-linux-gnu/pkgconfig/libprotobuf-c.pc is in libprotobuf-c-dev 1.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
bindir=${exec_prefix}/bin
Name: libprotobuf-c
Description: Protocol Buffers C library
Version: 1.2.1
Libs: -L${libdir} -lprotobuf-c
Libs.private:
Cflags: -I${includedir}
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