/usr/lib/pkgconfig/xorg-libinput.pc is in xserver-xorg-input-libinput-dev 0.27.1-1.
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 | sdkdir=/usr/include/xorg
Name: xorg-libinput
Description: X.Org libinput input driver.
Version: 0.27.1
Cflags: -I${sdkdir}
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