/usr/share/pkgconfig/xdg-desktop-portal.pc is in xdg-desktop-portal-dev 0.11-1.
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 | prefix=/usr
datarootdir=${prefix}/share
datadir=${datarootdir}
interfaces_dir=${datadir}/dbus-1/interfaces/
Name: xdg-desktop-portal
Description: Desktop integration portal
Version: 0.11
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