Qt3 on Leopard

Hi all, Is it possible to install qt3-mac on Mac OS X Leopard? When I try to install it, I get the error message "This version of Mac OS X is unsupported", but on Google I 've found the page http://qt3-mac.darwinports.com/ , which has the title "qt3-mac version 3.3.8 for Mac OS X 10.5 Leopard"... Thanks very much for any answers. Christos