NULL_IMPORT linking warning?

Hi all,

when linking my own library with sdl, sdl_image and sdl_mixer i 

get the following warnings from VC++6:

Creating library…
SDL_image.lib(SDL_image.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR
already defined in Sdl.lib(Sdl.dll); second definition ignored.

SDL_mixer.lib(SDL_mixer.dll) : warning LNK4006: __NULL_IMPORT_DESCRIPTOR
already defined in Sdl.lib(Sdl.dll); second definition ignored

all the modules are built with static muti-threaded link.

any sugestions.

-dv