Preheat oven to 200 degrees.
In a large roasting pan, combine the oats, wheat germ, wheat bran, oat bran, sliced almonds, salt and ground flaxseed.
In a medium saucepan, heat the brown sugar, olive oil, water and vanilla over medium heat until hot and sugar is melted.
Pour wet mixture over dry mixture and toss to combine. If dry mixture isn't damp, add a little more water.
Bake in preheated oven 3½ to 4 hours. Remove from oven and loosen granola from bottom of pan while still hot. Let cool in pan. When cool, store in an airtight container.