How do I check for accuracy with Cgreen?

I need to check for doubles in a unit test written using Cgreen. My comparisons and generated values ​​are very close, but assert_double_equal

says

1.95 != 1.94887879

      

        
        
        
      

    

How can I tell Cgreen to check with a certain precision? It's close enough for me.

PS: Stackoverflow won't let me create a new tag for Cgreen, but I hope some CUnit users have some experience with it.