/usr/lib/x86_64-linux-gnu/pkgconfig/argtable2.pc is in libargtable2-dev 13-1.
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=${prefix}
includedir=${prefix}/include
libdir=${prefix}/lib/x86_64-linux-gnu
Name: argtable2
Description: A library for parsing GNU style command line arguments
Version: 13
Libs: -L${libdir} -largtable2
Cflags: -I${includedir}
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