Additional constants:
NCURSES_A_NORMAL
NCURSES_A_STANDOUT
NCURSES_A_UNDERLINE
NCURSES_A_REVERSE
NCURSES_A_BLINK
NCURSES_A_DIM
NCURSES_A_BOLD
NCURSES_A_PROTECT
NCURSES_A_INVIS
NCURSES_A_ALTCHARSET
NCURSES_A_CHARTEXT