on a fresh 1.4.X, I get the following error message:
[EMAIL PROTECTED]:~/lyx-1.4.X> scons -f development/scons/SConstruct
frontend=qt qt_dir=/usr/lib/qt3 all
...
Checking for main() in C library c... yes
NameError: name 'frontend_libs' is not defined:
File "development/scons/SConstruct", line 1343:
env['VERSION_INFO'] = '''Configuration
For 1.4.x, frontend can only be qt2, which is the default. Also
/usr/lib/qt3 can usually be detected. To avoid the auto reload of the
wrong parameters, try:
scons -f development/scons/Sconstruct load_option=no
(or give the right parameters.)
Anyway, allowing you to specify qt as frontend should be consider as a
bug. I will check it.
Bo