[plt-scheme] Bitmap manipulation in terminal program

Hi all,

I have a terminal program which performs some bitmap manipulation,
however, requiring mred.ss just to use bitmap% and bitmap-dc% seems to
need the use of a display. How can I work around this?

$ mzc --exe endo endo.scm
mzc v370.6 [3m], Copyright (c) 2004-2007 PLT Scheme Inc.
 [output to "endo"]
$ ./endo
dynamic-require: unknown module: #%mred-kernel; need to run in MrEd
instead of MzScheme
$ mzc --gui-exe endo endo.scm
mzc v370.6 [3m], Copyright (c) 2004-2007 PLT Scheme Inc.
 [output to "endo"]
$ ./endo
DISPLAY environment variable not set and no -display argument


Cheers,
-- 
Paulo Jorge Matos - pocm at soton.ac.uk
http://www.personal.soton.ac.uk/pocm
PhD Student @ ECS
University of Southampton, UK