/usr/lib/x86_64-linux-gnu/pkgconfig/xkbcommon-x11.pc is in libxkbcommon-x11-dev 0.4.1-0ubuntu1.1.
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 10 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: xkbcommon-x11
Description: XKB API common to servers and clients - X11 support
Version: 0.4.1
Requires: xkbcommon
Requires.private: xcb xcb-xkb
Cflags: -I${includedir}
Libs: -L${libdir} -lxkbcommon-x11
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