/usr/lib/pkgconfig/xgks.pc is in libxgks-dev 2.6.1-3.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=/usr/include
Name: xgks
Description: X11 Graphical Kernel Subsystem
Version: 2.6
Libs: -L${libdir} -lxgks
Libs.private: -lgfortran
Cflags: -I${includedir}
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