+ dnl On some systems, -lreadline doesn't link without an additional
+ dnl -lncurses or -ltermcap.
+ dnl Try -lncurses before -ltermcap, because libtermcap is unsecure
+ dnl by design and obsolete since 1994. Try -lcurses last, because
+ dnl libcurses is unusable on some old Unices.
+ for extra_lib in "" ncurses termcap curses; do