mod operator in constants not allowed

as title, I get a compile error when I use the mod operator in constant 
expressions.

eg, with this program ...



     program pmod (Output);
     const
         c = 9 mod 5;    { <<<< error }
     begin
        WriteLn ('9 mod 5 is ', c);
     end. { pmod }

pmod.pas:3: error: constant has non-constant value


I can rewrite the constant as

     c = 9 - 5*(9 div 5);   { this is equivalent to 9 mod 5 }

without problems.

This seems strange to me -  am I missing something?
What makes it a non-constant?

Many Thanks


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