The import libraries were generatated with

  dll2imp vorbis.dll >vorbis.imp
  emximp -o vorbis.lib vorbis.imp
  emximp -o vorbis.a vorbis.imp
  dll2imp ogg.dll >ogg.imp
  emximp -o ogg.lib ogg.imp
  emximp -o ogg.a ogg.imp

The include files were taken from the source distribution.
