/usr/lib/x86_64-linux-gnu/pkgconfig/gtkextra-3.0.pc is in libgtkextra-dev 3.3.3-1.
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=${prefix}/include
target=x11
Name: GtkExtra
Description: Extra widget set for for GTK+
Requires: glib-2.0 gtk+-2.0
Version: 3.3.3
Libs: -L${libdir} -lgtkextra-${target}-3.0
Cflags: -I${includedir}/gtkextra-3.0
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