/usr/lib/x86_64-linux-gnu/pkgconfig/x11-xcb.pc is in libx11-xcb-dev 2:1.6.4-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: X11 XCB
Description: X Library XCB interface
Version: 1.6.4
Requires: x11 xcb
Cflags: -I${includedir}
Libs: -L${libdir} -lX11-xcb
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