prototype declaration to
   <B>tiffiop.h</B> (close to the bottom).
<LI>Create a file with the compression scheme code, by convention files
   are named <B>tif_*.c</B> (except perhaps on some systems where the
   tif_ prefix pushes some filenames over 14 chars.
<LI>Edit <B>Makefile.in</B> (and any other Makefiles)
   to include the new source file.
</OL>

<P>
A codec, say <TT>foo</TT>, can have many different entry points:

<PRE>
TIFFInitfoo(tif, scheme)/* initialize scheme and setup entry points in tif */
