I'm working on building Open-Sankoré project (https://github.com/Sankore/Sankore-3.1) which is made by Qt 4.8-msvc compiler..
But, visual studio 2015 only works with Qt5 and doesn't accept Qt4 packages directly..
So my question is whether there's any walk-around that could be done to make visual studio build Qt 4.8 projects ?
You would have to compile Qt4.8 from source if you want to use Visual Studio 2015 with that exact version (4.8). There is no official release of Qt4.8 that was built using msvc2015.
If you are really tied to the Qt4.8 version, my suggestion would be to download and install lower version of Visual Studio and the corresponding compiler, e.g., msvc2008.
Although, before doing so, I would confirm if the project you are trying to build is really bounded to the Qt4.8 version. It might work as expected with the higher Qt version; or with some added modifications.