Qwt 5.0.2 ... 2007-06
Qwt 5.1.0 ... 2008-05
Qwt 5.2.0 ... 2009-03
Qwt 5.2.1 ... 2010-04  <<--- RiverWare 6.2 (Qt 4.6.3)
Qwt 6.0.0 ... 2011-04
Qwt 5.2.2 ... 2011-08  <<--- RiverWare 6.3 (Qt 4.8.2)
Qwt 6.0.1 ... 2011-08