We are using third party tools to analyse code at runtime, e.g. for memory allocation and proper freeing this memory. (http://duma.sourceforge.net/)
These tools require to redefine the standard memory allocation routines.
The problem is that in some of your classes, internaly used methods redefine the standard methods like malloc or free or realloc. This will cause many compilation errors. This worked fine with Qt 3.3.8, but since we changed to QT 4.x we cannot use these tools any more

E.g:
/home/src/qt/4.7.2/include/QtCore/../../src/corelib/tools/qvector.h:86: error: variable or field 'free' declared void
/home/src/qt/4.7.2/include/QtCore/../../src/corelib/tools/qvector.h:96: error: function definition does not declare parameters
/home/src/qt/4.7.2/include/QtCore/../../src/corelib/tools/qvector.h:305: error: expected identifier before string constant
/home/src/qt/4.7.2/include/QtCore/../../src/corelib/tools/qvector.h:305: error: expected ',' or '...' before string constant

Suggestion: avoid naming your methods with standard names from c or c++ functions