last sources with tla/arch

hi list
any infos/tips on how to compile the last sources from the arch repository?
i have problems with QT4, it seems that the configure scripts had been 
modified recently, and now QT4 is not found...
with an older version of the sources (dont know exactly which one...) 
qt4 is well recognized
any infos?
ps : i really like the new gui : 'the widgets in docks' is nice

pierre