Hello to everyone,
this is my first post on the community.

I downloaded and rebuilt Qwt following this helpful HowTo and this document on my Win7 machine.
I understood that
The Designer plugin and the corresponding Qwt library ( if the plugin has not been built self containing ) have to be compatible with Qt version of the application loading it ( usually the Qt Creator ) - what is often a different version of the Qt libraries you want to build your application with. F.e on Windows the Qt Creator is usually built with a MSVC compiler - even if included in a MinGW package !
this is the reason why I built Qwt with VS2008.
But probably this is the wrong compiler (since I get "Plugin verification data mismatch" message with Qt Creator 3.6.1).
I downloaded a prebuilt version of Qt 4.8.4 + Qt Creator for Windows from here, so I thought VS2008 was the right compiler.

Could someone tell me which is the right compiler that I should use to build Qwt?

Thanks in advance