Page to record guidelines for adapting
C source code to deal with the CONST-ified
interfaces of Tcl/Tk 8.4.
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Most stuff can be fixed by putting CONST (or, if you're unlucky, CONST84) in your types.  Sometimes you might need to add a cast.  Anything that traditionally worked, will continue to work.  There's also a symbol you can #define to switch off the constness in the interface (whose name I don't remember)