I've solved the problem myself. Ironically, I found some useful information from a French website; even worse, French and I don't know each other very well. Anyway, i copied libqte.2.3.6 from /opt/Qtopia.rom/lib on Archos PMA400, which is the lower version of current libqte supplied in Qtopia 1.7 SDK. And i changed the links to point libqte.so.2.3.6 instead of libqte.2.3.7. After that, the compiler complained that libz is required, however, this libz doesn't exist in both PMA400 SDK and Qtopia SKD. I found it on the Archos PMA again under /usr/lib. Eventually, the problem solved. Hope this is helpful to whoever has the same problem.