I may have an intermediate solution for astroberry users.
I've made Debian installation packages for libraw_0.20.2-1 for arm7 (RPI) as a backport of 'bullseye' release. My astroberry version is Raspbian version 10 which is based on Debian 'buster'.
The packages are attached in a zip file and can be tested.  

Installation instructions :

# Unzip the zip file on your astroberry
unzip astroberry-libraw_0.20.2-1_armhf.zip
# This extracts two package files : libraw20_0.20.2-1_armhf.deb and libraw-bin_0.20.2-1_armhf.deb

# Install both packages
 sudo dpkg -i libraw20_0.20.2-1_armhf.deb libraw-bin_0.20.2-1_armhf.deb
# This upgrades libraw-bin from 0.19.2-2 to 0.20.2-1 and installs libraw20:armhf next to libraw19:armhf

# Now the tricky part, we still have libraw19:armhf and its libraries are used by kstars etc. 
ls -la /usr/lib/arm-linux-gnueabihf/libraw* | grep -v libraw1394
# This produces :
# We have both libraw version 19 and 20 libraries. Now the dirty part: we can repoint the symlinks :
sudo ln -sf /usr/lib/arm-linux-gnueabihf/libraw.so.20.0.0 /usr/lib/arm-linux-gnueabihf/libraw.so.19
sudo ln -sf /usr/lib/arm-linux-gnueabihf/libraw_r.so.20.0.0 /usr/lib/arm-linux-gnueabihf/libraw_r.so.19
# This way only the libraw version 20 will be used.

That's it. Test away. I cannot test myself as my Canon camera is too old and has a broken USB socket.


In case you want to revert :
sudo ln -sf /usr/lib/arm-linux-gnueabihf/libraw.so.19.0.0 /usr/lib/arm-linux-gnueabihf/libraw.so.19
sudo ln -sf /usr/lib/arm-linux-gnueabihf/libraw_r.so.19.0.0 /usr/lib/arm-linux-gnueabihf/libraw_r.so.19
sudo apt remove libraw-bin libraw20:armhf
sudo apt install libraw-bin # this gets you the 19 version back from the repository

-- Hans

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