Hi this story comes from late 70's ish. Apocalyptic tale where a lone human first finds haven and repairs a robot after a war (could be biowar too). He is constantly put back into suspended animation as his robots fix things, provide food (from the seeds in his pants cuff). Final scene he is awaken again and sprayed with something to tint the color of his skin to appear like a new native humanoid species. Commentary is by the robots who evolve into higher beings, who follow the main characters wishes for evolution not to be advanced through conflict.