/usr/lib/pkgconfig/xkbcomp.pc is in x11-xkb-utils 7.7+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}
xkbconfigdir=${datadir}/X11/xkb
Name: xkbcomp
Description: XKB keymap compiler
Version: 1.2.4
Requires.private: x11 xkbfile xproto >= 7.0.17
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