I have add these lines to qtvars.bat (This is the bat file that "Build Debug Libraries" executes):
set LIB=E:\Develop\MinGW\lib
set LIB=E:\Develop\Qt\4.3.4\lib
set INCLUDE=E:\Develop\MinGW\include
set INCLUDE=E:\Develop\Qt\4.3.4\include
(I have installed Qt and MinGW in E:\Develop)
And then everything is OK.
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