/usr/lib/x86_64-linux-gnu/pkgconfig/hkl.pc is in libhkl-dev 4.99.99.1955-2.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: hkl
Description: Library for hkl Diffractometer computation
Version: 4.99.99.0
URL: http://repo.or.cz/w/hkl.git
Requires: gsl
Libs: -L${libdir} -lhkl
Libs.private: -lm
Cflags: -I${includedir}/hkl-4
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