/usr/lib/x86_64-linux-gnu/pkgconfig/libpeas-gtk-1.0.pc is in libpeas-dev 1.16.0-1ubuntu2.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libpeas-gtk
Description: libpeas-gtk, a GObject plugins library (Gtk widgets)
Requires: glib-2.0 >= 2.38.0, gtk+-3.0 >= 3.0.0, libpeas-1.0 >= 1.16.0
Version: 1.16.0
Cflags: -I${includedir}/libpeas-1.0
Libs: -L${libdir} -lpeas-gtk-1.0
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