nmake install, Cannot perform a cyclic copy

Hello, After successfully compiling Qt4 on my Windows 7 machine (VS 2010 SP1) with “nmake”, I typed “nmake install”. I get errors with xcopy command such as below. I’m surprised. Is there a know script bug or did I do something wrong? xcopy /s /q /y /i c:\Qt\qt4.8.5\mkspecs\linux-g++-64 c:\Qt\qt4.8.5\mkspe cs\linux-g++-64 Cannot perform a cyclic copy