/usr/lib/x86_64-linux-gnu/pkgconfig/xfixes.pc is in libxfixes-dev 1:5.0-4ubuntu4.4.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Xfixes
Description: X Fixes Library
Version: 5.0
Requires: xproto fixesproto >= 5.0
Requires.private: x11
Cflags: -I${includedir}
Libs: -L${libdir} -lXfixes
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