[s60] file 'string' cannot be opened

[estel]

I have instaled 4.5.2-tower, added new sources to PATH and set path to tower in carbide. I create new project and add one button but during compilation :

c:\Qt\4.5.2-tower\src\corelib\tools\qstring.h:60: the file 'string' cannot be opened

c:\Qt\4.5.2-tower\src\corelib\tools\qstring.h:60: the file 'string' cannot be opened

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and after this there are many many errors connected with qstring.h. Do you have some explenation?