@The2Ring
welcome to devnet forum
I have not done a build of Qt libs myself for some time. Therefore, I am not completely sure, but the building scripts are typically not happy about the use of backslashs '\'. Those are certainly the main folder separators for windows, but may need escaping. The scripts of Qt are originally coming from linux. Therefore in a lot of places it is better to use the forward slash '/' instead.
I have seen that you have used already the forward slash with LIBS and INCLUDEPATH. So you are aware of the issue. However, you have used with configure.bat back slashes.
In my opinion it is certainly worth a try with forward slashes. This is sometimes as a miracle and solving issues which are hard to understand.
