/usr/lib/x86_64-linux-gnu/pkgconfig/xcb.pc is in libxcb1-dev 1.8.1-1.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
xcbproto_version=1.7
Name: XCB
Description: X-protocol C Binding
Version: 1.8.1
Requires.private: pthread-stubs xau >= 0.99.2 xdmcp
Libs: -L${libdir} -lxcb
Libs.private:
Cflags: -I${includedir}
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