[Dev-C++] Accessing static data from non-static function

[Klaas M. <kla...@gm...>]

Hey, I am trying to make a class with some static pointers to allegro
bitmaps. But now i cannot access the static data on the normal way. I
declared the data so: static BITMAP* bmp; and tried to access it from other=
,
non-static member functions from the same class by using simply bmp, but
that don't work. Using Classname::bmp also don't work, not in the other
non-static member functions from the same class, and not from other
functions, such as main(). I have included the header file. I always get th=
e
same error's:   [Linker error] undefined reference to `Classname::bmp'  for
every time I tried to access the static date.

I have also tried to make a static int but that also don't work. Could
anyone tell me what i'm doing wrong?