Greetings and a Merry Christmas to All!
It seems to me there is a bug in tests.lisp.
I compiled maxima-pre59 against gcl-2.4.0 (RH6.0).
All tests works fine except rtest4.mac.
After 71 problem I have
"Using ratsimp
Polinomial quotent is not exact
-- an error ...."
I checked this test manually step by step and it works fine!
Then I replaced the new "tests.lisp" by one from maxima-5.6.
And all tests were passed without errors.
best luck
Valerij