AC_SEARCH_LIBS([rl_free_keymap], [readline], [], [have_readline="no"])
if test "$have_readline" = "no"; then # try with -lcurses
# clear cache
AC_SEARCH_LIBS([rl_free_keymap], [readline], [], [have_readline="no"])
if test "$have_readline" = "no"; then # try with -lcurses
# clear cache