/usr/lib/pkgconfig/xorg-joystick.pc is in xserver-xorg-input-joystick-dev 1:1.6.3-1.
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 | prefix=/usr
includedir=${prefix}/include
Name: xorg-joystick
Description: X.Org joystick input driver.
Version: 1.6.3
Cflags: -I${includedir}
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