Just wanted to report that none of the root versions available are curently comatible with the latest windows SDK in MSVC. That moight be an issue for some people but a workaround exist by selecting the installation of an older sdk and built tools during the Visual Studio installation.
The setup that seems to work for the moment is version 14.26.28801, while anything above will not properly work. If someone has already installed both versions, it is possible to correctly set the environment to use the compatible version by calling:
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat
followed by the options: x86 10.0.18362.0 -vcvars_ver=14.26.28801
The first option is the windows SDK version, and the one mentioned above is also stable and seems to be compatible with version 6.22 and 6.24.
I am a bit puzzled though because in the precompiled binaries for Root I though that FFTW was included by default for root 6. Isn’t that the case for windows builds?