/usr/lib/x86_64-linux-gnu/pkgconfig/libhdate.pc is in libhdate-dev 1.6.02-1build1.
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
includedir=${prefix}/include
Name: libhdate
Description: A c/cpp library for hebrew dates
Version: 1.6.02
Libs: -L${libdir} -lm -lhdate
Cflags: -I${includedir}
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