/usr/share/pkgconfig/xkeyboard-config.pc is in xkb-data 2.23.1-1ubuntu1.
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 | prefix=/usr
datarootdir=${prefix}/share
datadir=${datarootdir}
xkb_base=/usr/share/X11/xkb
Name: XKeyboardConfig
Description: X Keyboard configuration data
Version: 2.23.1
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