[Dev-C++] Confused about a compiler error!!

namespace Merry{
    class Christmas{
       public:
          // This line is fine!
          static const std::ios_base::openmode To_all = std::ios_base::in;
          // The below line triggers an error ?
          static const std::ios_base::openmode To_Ya  = 
std::ios_base::out | std::ios_base::app;
       protected:
          ///Bla, bla, bla
    };
}
Gives me the following error:
finelname:line: field initializer is not constant

Why is it that 'Merry::Christmas::To_all' is a prblem for the compiler, 
but 'Merry::Christmas::To_Ya' is otherwise?

Anybody?

By the way, what I want is to have access to those variables from 
another program, using the scope specifiers, will that do the trick?

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