There seems to be something fishy with the license checking. When one selects the commercial option, configure gets stuck and doesn't proceed any further. It has worked in beta3, but not in RC.

Steps to reproduce:

1. download the Qt5.9.0 RC enterprise source package
2. unzip it
3. run ./configure
4. select 'c' from "Selecting Qt Edition"

Expected result:

Configure starts to run.

Actual result:

Configure gets stuck and doesn't proceed any further.

Note! It works if you download the opensource monolite src package. If you do the steps above, configure runs after the license checking queries.