Only the cutting edge is not quite good idea for a project with ~15 y history and a library... there are plenty of software around the world, which use older versions directly or as dependencies. Plenty of publications citing "we are using version XXX"
, which might be 5 or more years old.
Well, that is exactly what the archive is for...
G0 Cell Unit, Okinawa Institute of Science and Technology Graduate University
1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan