metapost problem

[Marc van Dongen <dongen@cs.ucc.ie>]

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Hello mpost fans,

[appologies for this second submission. I
 just realised I forgot to add the attachments.]

I am having a problem I cannot understand.
Perhaps there's something wrong with my
installation. When I run mpost on attached
tmp.mp I get attached tmp.0.

I would have expected the letter $x$ to be
positioned at (1cm,0) but instead it is
positioned at (0,0). I've use boxes many
times but thins I cannot understand. Am I
doing something terribly wrong? Am I
overlooking something?  Any other suggestions?

Regards,

Marc van Dongen
-- 
     Marc van Dongen, CS Dept | phone:  +353 21 4903578
University College Cork, NUIC | Fax:    +353 21 4903113
  College Road, Cork, Ireland | Email: dongen@cs.ucc.ie

[-- Attachment #2: tmp.mp --]
[-- Type: text/plain, Size: 303 bytes --]

verbatimtex
\documentclass{article}
\begin{document}
etex;

defaultfont := "cmr12";
defaultscale := 12pt /fontsize defaultfont;
input mp-tool;
prologues := 2;
input boxes;

beginfig(0)
  boxit.xl( btex $x$ etex );
  xl.s  := (1cm,0);
  drawarrow xl.s - (0,1cm) -- xl.s;
  drawboxed( xl );
endfig;

end.

[-- Attachment #3: tmp.0 --]
[-- Type: text/plain, Size: 798 bytes --]

%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: -4 -29 30 8 
%%Creator: MetaPost
%%CreationDate: 2000.09.26:1853
%%Pages: 1
%%DocumentFonts: cmmi10
 /cmmi10 /cmmi10 def
/fshow {exch findfont exch scalefont setfont show}bind def
%%EndProlog
%%Page: 1 1
%%HiResBoundingBox: -3.25 -28.59645 29.87724 7.53952
 0.5 0 dtransform exch truncate exch idtransform pop setlinewidth [] 0 setdash
 1 setlinecap 1 setlinejoin 10 setmiterlimit
newpath 28.34645 -28.34645 moveto
28.34645 0 lineto stroke
 0 0.5 dtransform truncate idtransform setlinewidth pop
newpath 29.87724 -3.69557 moveto
28.34645 0 lineto
26.81566 -3.69557 lineto
 closepath
gsave fill grestore stroke
0 0 moveto
(x) cmmi10 9.96265 fshow
newpath -3 -3 moveto
8.69391 -3 lineto
8.69391 7.28952 lineto
-3 7.28952 lineto
 closepath stroke
showpage
%%EOF