These files provide additional functionality on Mac OS X

image.m
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This file will use bmpwrite to turn an image into .bmp format and then send it to Preview.app (or your viewer of choice). 

OFSndPlay.cc
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Provides the utility 'ofsndplay' to play various sound formats. Despite being Obejctive-C, the source uses a .cc suffix to be detected by PKG_ADD.

doc/ofosx.tex
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This is a document that details the Mac OS X port of octave and octave-forge to some extent. 
(The document is now (2004-04-15) mostly of archeological interest...)
     