I noticed (in GNU APL 1.2) that I did not get readline to work.
I tried using "./configure --with-readline" to force Readline to be used, but that informed me it was not found (Though it was installed, including development packages).
After looking at the config.log, it turned out it was actually ncurses-dev that was missing instead.
I don't know whether this qualifies as bug, but it is confusing at least :).