Where do I have to put a definition so that mape loads it and I can use it with #include?

For example:

#include Library_Map
#include Library_Map_Biomes

func InitializeMap()
{
  CreateCanyonBiome(100, nil, 150, 100);
  return true;
}


But where would I put LibraryMapBiome.ocd so that Mape finds it and I can include it?