The version of qtopia for SDL

dear all:
I have compiled SDL for qtopia 2.0 and qtopia 1.5 with arm-linux-gcc 2.95 sucessfully. But when I compiled applications (it has a simple window that has no controls on it), I failed in SDL for qtopia 1.5. It tells me that I have many undefined reference in I try to readelf this dynamic link library but find no such reference such as closeEvent(); All these reference can be found in libraries of qtopia 2.0.
I’d like to know what cause this problem? What can I do if I still want to compile this simple application in qtopia 1.5.
thanks in advance!
yours dragon-------------------------------------------------------------------------------------