I'm not able to install the MySQL plugin for Qt 4.1.0, because the nmake command does not find the file "stddef.h" located in the include directory of Microsoft Visual Studio .NET 2003. I get the following error message:

c:\Qt\4.1.0\include\QtCore\../../src\corelib\global\qglobal.h(25) : fatal error C1083: Cannot open include file: 'stddef.h': No such file or
directory

I am using the following commands

cd %QTDIR%\src\plugins\sqldrivers\mysql
qmake -o Makefile "INCLUDEPATH+=C:\Program Files\MySQL\MySQL Server 5.0\include" "LIBS+=C:\Program Files\MySQL\MySQL Server 5.0\lib\opt\LIBMYSQL.LIB" mysql.pro
nmake

Why does the nmake command fail?