/usr/lib/x86_64-linux-gnu/pkgconfig/x11.pc is in libx11-dev 2:1.6.3-1ubuntu2.
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 14 15 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
xthreadlib=-lpthread
Name: X11
Description: X Library
Version: 1.6.3
Requires: xproto kbproto
Requires.private: xcb >= 1.1.92
Cflags: -I${includedir}
Libs: -L${libdir} -lX11
Libs.private: -lpthread
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