[Mingw-users] how do I declare a variable as being "not extern"

[Jonathan W. <jo...@tp...>]

Basicly, if I declare the variable like so:
DWORD __tls_index;
GCC emits this as an extern.
I want to declare it as "inside the file I am compiling, uninitalized and 
visible to other files". What do I need to do to do that?