Yep, it was "Man in the Wilderness" made in 1971, based on the real story of Zack Bass I guess.
He made a lot of good wilderness type movies. His "Man Called Horse" ones were interesting, if a little embellished maybe.
Dang, I need to find that movie somewhere. I'd like to see it again. I remember one scene in it where he encounters an indian couple on horseback. The squaw is pregnant and in labor, and finally they stop and she gets off the horse, steps out into the woods, spreads out a blanket, grabs an old stump, bears down for a bit, then has the kid. She then gets back on the horse with the brave and the kid and they leave. That'd be one tough woman!
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)