/usr/lib/x86_64-linux-gnu/pkgconfig/xfont2.pc is in libxfont-dev 1:2.0.1-3~ubuntu16.04.3.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Xfont2
Description: X font Library version 2
Version: 2.0.1
Requires: xproto fontsproto
Requires.private: fontenc freetype2
Cflags: -I${includedir}
Libs: -L${libdir} -lXfont2
Libs.private: -lz -lbz2 -lm
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