/usr/lib/x86_64-linux-gnu/pkgconfig/poppler-glib.pc is in libpoppler-glib-dev 0.18.4-1ubuntu3.2.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: poppler-glib
Description: GLib wrapper for poppler
Version: 0.18.4
Requires: glib-2.0 >= 2.18 gobject-2.0 >= 2.18 cairo >= 1.10.0
Requires.private: poppler = 0.18.4
Libs: -L${libdir} -lpoppler-glib
Cflags: -I${includedir}/poppler/glib
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