Heat the oil in a sauté pan, add the flour and sauté for about 5 minutes, or until the flour is just beginning to brown. Add the chili powder, cumin, oregano, garlic, onion, and regular salt, stir well. Add the water and beef stock, stir well; bring to a simmer. Allow to simmer, stirring and adding more water and beef broth (in equal portions) until you have the sauce consistency you desire. Simmer for 20 minutes; taste and adjust seasonings.