Man: What do you do when you do the accounts?
Woman: I make out checks. So much to do and so little time to do it in.
Man: Do you think you’ll make it?
Woman: Sure. I’ll make it.
Man: But do you make enough money for everything you do?
Woman: Just enough. I make do.
Man: So do I. I make do as well. I get by. I get up in the morning. I get dressed. I get on the bus. I get off the bus. I get to work.
What does “I make do” mean?