[Freeswitch-dev] why i can't compile FSComm successfully on my windows ?

hi, i downloaded the Qt system for windows, but i can't compile the FSComm succesffuly under winXP. i compiled it using VS 2008. the errors are : =================== RCC resources.qrc system can't find the specified path Project : error PRJ0019: the following error code is returned:: "RCC resources.qrc" project: : warning PRJ0018 : the following environment variable is not found: $(QTDIR) =================== i guess $(QTDIR) should be the path of the root of Qt, but i already set the $(QTDIR) to my real path (in my pc, i installed the Qt into f:\qt\4.0.7). so how to configure the path of $(QDIR) in VS2008 ? is there any other reason of failure ? thanks and best regards. chinamaple