Package: cupt Version: 2.9.8 Your package has a hardcoded Suggests on libreadline6 which is scheduled for removal (see #840397), please switch to libreadline7.
Would it not be better to just link against libreadline, rather than playing dlopen tricks which need to be adjusted on every readline soname bump? After all, libreadline is installed on most systems anyway. -- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable'), (101, 'experimental') Architecture: i386 (x86_64) Kernel: Linux 4.8.10-nouveau (SMP w/2 CPU cores) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)