/usr/lib/x86_64-linux-gnu/pkgconfig/libsx.pc is in libsx-dev 2.08-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libsx
Description: Simple X library to make writing X applications easier
Version: 2.08
Libs: -L${libdir} -lsx
Libs: -lXaw3dxft -lXmu -lXt -lXext -lXpm -lSM -lICE -lX11
Cflags: -I${includedir}
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