xcalc*background: BACKGROUND
xcalc*foreground: FOREGROUND
!xcalc*bevel.Background: LOWLIGHT
!xcalc*bevel.screen*background: WINDOW_BACKGROUND
!xcalc*bevel.screen*foreground: WINDOW_FOREGROUND
xcalc*bevel.screen.LCD.background: WINDOW_BACKGROUND
xcalc*bevel.screen.LCD.foreground: WINDOW_FOREGROUND