I have fixed this issue. See below. I will have an scons-style RPM spec file soon (with some minimal changes to SConstruct).
Index: SConscript =================================================================== --- SConscript (revision 13969) +++ SConscript (working copy) @@ -58,7 +58,7 @@ # sync frontend and env['frontend'] (maybe build qt4 with frontend=qt3) if build_qt3: frontend = 'qt3' - env['frontend'] = 'qt4' + env['frontend'] = 'qt3' elif build_qt4: frontend = 'qt4' env['frontend'] = 'qt4'