/usr/lib/x86_64-linux-gnu/pkgconfig/libsx.pc is in libsx-dev 2.05-7.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
Name: libsx
Description: Simple X library
Version: 2.05
Libs: -L${libdir} -lsx
Requires.private: xt xmu xpm xaw7
Libs.private: -$L{libdir} -lsx -lX11 -lXpm -Xaw -Xmu
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