On my system I get a warning about an undefined variable
$DRAW_USE_PNGCAIRO when loading the draw package.
Maxima version: 5.23post
Maxima build date: 11:42 1/8/2011
Host type: i686-pc-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.45
(%i1) load(draw);
; (AND (EQ MAXIMA::VAL 'MAXIMA::$PNG) MAXIMA::$DRAW_USE_PNGCAIRO)
; --> IF AND
; ==>
; (THE T MAXIMA::$DRAW_USE_PNGCAIRO)
;
; caught WARNING:
; undefined variable: $DRAW_USE_PNGCAIRO
;
; compilation unit finished
; Undefined variable:
; $DRAW_USE_PNGCAIRO
; caught 1 WARNING condition
(%o1) /usr/local/share/maxima/5.23post/share/draw/draw.lisp
Dieter Kaiser