pkg-config issue on Raspberry Pi bullseye

[maxim-sloyko-yohana]

I'm not sure this is the right place to report the packaging problem, so my apologies if it's not.
The libmosquitto.pc file in Raspberry Pi bullseye distribution currently looks like this:

prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib

Name: mosquitto
Description: mosquitto MQTT library (C bindings)
Version: 2.0.11
Cflags: -I${includedir}
Libs: -L${libdir} -lmosquitto

However, libmosquitto.so is actually installed at /usr/lib/aarch64-linux-gnu/libmosquitto.so.
This can lead to -lmosquitto not found linking error. On my system I had to change the libdir= line above to

libdir=${exec_prefix}/lib/aarch64-linux-gnu

for my pkg-config based build to work.