/usr/lib/x86_64-linux-gnu/pkgconfig/xt.pc is in libxt-dev 1:1.1.1-2build1.
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=${prefix}/include
appdefaultdir=/etc/X11/app-defaults
Name: Xt
Description: X Toolkit Library
Version: 1.1.1
Requires: xproto x11
Requires.private: ice sm
Cflags: -I${includedir}
Libs: -L${libdir} -lXt
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