ps: in the second step: configure there are many warnings as following , it just shows some of them , and others are similar to them. 'unmatched parentheses are deprecated.' Reading /home/test/lighthouse/demos/qtdemo/<a href="http://qtdemo.pro">qtdemo.pro</a> WARNING: /home/test/lighthouse/mkspecs/features/unix/gdb_dwarf_index.prf:8: Unmatched parentheses are deprecated. Reading /home/test/lighthouse/demos/declarative/<a href="http://declarative.pro">declarative.pro</a> Reading /home/test/lighthouse/demos/declarative/minehunt/<a href="http://minehunt.pro">minehunt.pro</a> WARNING: /home/test/lighthouse/mkspecs/features/unix/gdb_dwarf_index.prf:8: Unmatched parentheses are deprecated. I think it would better for you to help me to analyse this problem. Regards, Haimei Li