/usr/lib/pkgconfig/diagnostics.pc is in libdiagnostics-dev 0.3.3-11build1.
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/diagnostics
Name: diagnostics
Version: 0.1
Description: Diagnostics library.
Libs: -L${libdir} -ldiagnostics
Cflags: -I${includedir}
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