optional_depends readline \
		 'USE_READLINE=-DUSE_READLINE READLINE_LIB=-lreadline READLINE_EXTRAS=-lhistory READLINE_EXTRAS+=-lncurses' \
		 '' \
		 'for line editing support' &&

optional_depends less \
		 'CALCPAGER=less' \
		 'CALCPAGER=more' \
		 'use "less" instead of "more" as the default pager'