/usr/lib/x86_64-linux-gnu/pkgconfig/libHX.pc is in libhx-dev 3.21-1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libHX
Description: Useful collection of routines for C and C++ programming
Version: 3.21
Cflags: -I${includedir}
Libs: -L${libdir} -lHX
Libs.private: -ldl
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