/usr/lib/x86_64-linux-gnu/pkgconfig/input-pad.pc is in libinput-pad-dev 1.0.3-1build1.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/input-pad-1.0
kbduidir=${prefix}/lib/x86_64-linux-gnu/input-pad-1.0/modules/kbdui
xkeysenddir=${prefix}/lib/x86_64-linux-gnu/input-pad-1.0/modules/xkeysend
Name: input-pad
Description: Input Pad
Version: 1.0.3
Requires: glib-2.0 gtk+-3.0
Cflags: -I${includedir}
Libs: -L${libdir} -linput-pad
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