/usr/lib/x86_64-linux-gnu/pkgconfig/libgfchangelog.pc is in glusterfs-common 3.5.2-2+deb8u3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libgfchangelog
Description: GlusterFS Changelog Consumer Library
Version: 3.5.2
Libs: -L${libdir} -lgfchangelog -lglusterfs
Cflags: -I${includedir}/glusterfs/gfchangelog -D_FILE_OFFSET_BITS=64 -D__USE_FILE_OFFSET64
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