Would be wary of recommending "sight unseen" and not knowing anything else. There could be many reasons for that, certainly including (but not limited to) insufficient fat in the diet.
Flaxseed oil is a bit unstable -- OK in small amounts and if kept refrigerated and used sparingly. Combine saturated and monounsaturated fats. Something between about 40 and 80 % of calories as fat probably covers what most indigenous people eat.
A little magnesium citrate can get things moving. And eat to nurture your gut flora.