Some update: after having reinstalled libfprint, fprint_demo and pam_fprint from source, everything works again like before.
I don't know if it can be related, but during installation libfprint required a header file of ImageMagick, most notably magick/ImageMagick.h. This file couldn't have been found in the package
graphicsmagick-libmagick-dev-compat as it was in my opinion supposed to be as this is a compatibility package.
So in order to make libfprint work I ended up reinstalling libmagick. To be honest I don't think this would be an ideal solution, however, it may be needed to test if libfprint could function with libmagick being installed.
Some update: after having reinstalled libfprint, fprint_demo and pam_fprint from source, everything works again like before.
I don't know if it can be related, but during installation libfprint required a header file of ImageMagick, most notably magick/ ImageMagick. h. This file couldn't have been found in the package -libmagick- dev-compat as it was in my opinion supposed to be as this is a compatibility package.
graphicsmagick
So in order to make libfprint work I ended up reinstalling libmagick. To be honest I don't think this would be an ideal solution, however, it may be needed to test if libfprint could function with libmagick being installed.