Already done, patch already there, static member already exists for libs that 
want to support it.

> I would not do this, as it will make it impossible to link unrelated
> fltk-using code together as this would have to be a static value. Or we
> have to waste space to put the value on every widget.
>
> The user should be able to turn on the "don't interpret @" flag on the
> widgets they need it for.
>
> If they actually want @-commands to work with their strings, it seems
> they must be modifying them to add these commands. They should be able
> to double the @ signs in the original string at the same time.
>
> On 12/08/2011 01:22 AM, MacArthur, Ian (SELEX GALILEO, UK) wrote:
> >
> >> In fltk2 a flag was added to the widget and to the arguments
> >> to the draw
> >> functions that disabled all interpretation of '@'.
> >
> > I think that's in fltk-1 also.
> >
> >> There was also an @ command (I forget which)
> >> which disabled interpretation for the rest of the label.
> >
> > I think it was "@.", at least it is in fltk-1
> >
> > I think what the OP wants is a way to (globally) change the "@" symbol
> > to "some other symbol", to make it easier to use @ as a symbol in its
> > own right.
> >
> > This is non-trivial though since we have the @ value hard-coded in a few
> > places...

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