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/usr/lib/x86_64-linux-gnu/pkgconfig/x11-xcb.pc is in libx11-xcb-dev 2:1.4.99.1-0ubuntu2.

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prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include

Name: X11 XCB
Description: X Library XCB interface
Version: 1.4.99.1
Requires: x11 xcb
Cflags: -I${includedir}
Libs: -L${libdir} -lX11-xcb