>> Scons versions installs the stuff >> >> just fine, but it does not copy the binaries other than lyx and >> texlyx.
Scons, as a build system, build lyx and install all lyx related stuff like lyx2lyx. A developer is supposed to give lyx a working environment by e.g. setting $PATH to the QT library directory. The windows installer will copy QT and related libraries to whereever you want. Cheers, Bo