/usr/share/pkgconfig/kbproto.pc is in x11proto-kb-dev 1.0.6-2.
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
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: KBProto
Description: KB extension headers
Version: 1.0.6
Cflags: -I${includedir}
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