/usr/lib/x86_64-linux-gnu/pkgconfig/gnome-desktop-3.0.pc is in libgnome-desktop-3-dev 3.18.2-1ubuntu1.
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=${prefix}/include
Name: gnome-desktop-3.0
Description: Utility library for loading .desktop files
Requires: gtk+-3.0 gsettings-desktop-schemas
Version: 3.18.2
Libs: -L${libdir} -lgnome-desktop-3
Cflags: -I${includedir}/gnome-desktop-3.0
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