Qt 4.6.0 source+ minGv + compile errors

I am trying to compile Qt 4.6.0 from source, because Qwt 5.2. does link run if I use Qt 4.6. sdk.
Well, I downloaded the source and start compile with mingw32-make.
After hours of compiling I got the errors ( I put only the main lines):

.....backendnode.h:37 IPin was not configured in this scope....
.....backendnode.h:37 template argument 1 is invalid

and so on, all erros in backednode.h.
Why? I'm missing something?
Regards

Some more background would be helpful. What are you compiling to be exact? Where does the error occur?