/usr/lib/x86_64-linux-gnu/pkgconfig/libqapt.pc is in libqapt-dev 3.0.2-1+b3.
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=/usr
libdir=/usr/lib
includedir=/usr/include/libqapt
Name: libqapt
Description: Qt wrapper around libapt-pkg
Version: 3.0.2
Libs: -L${libdir} -lQApt
Cflags: -I${includedir}
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