/usr/lib/pkgconfig/xorg-evdev.pc is in xserver-xorg-input-evdev-dev 1:2.10.1-1ubuntu2.
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 | sdkdir=/usr/include/xorg
Name: xorg-evdev
Description: X.Org evdev input driver.
Version: 2.10.1
Cflags: -I${sdkdir}
|