DOC: update xcode and msvc dependencies for macx and windows

Documentation/SoftwareGuide/Latex/Installation.tex

@@ -291,12 +291,11 @@ before starting superbuild. http://doc.qt.io/qt-4.8/requirements-x11.html
 For a debian 8.1 systeme, I installed all Qt4 dependencies with below 'apt-get install'
 \texttt{apt-get install libx11-dev libxext-dev libxt-dev libxi-dev libxrandr-dev libgl1-mesa-dev}
 
-For Mac OSX and Windows, there is no additional package required because Qt uses
-Windowing system of that platform which is available on your system.
-
 You can also deactivate QT4 and skip this by passing \texttt{-DOTB\_USE\_QT4=OFF} to cmake.
 This will give you OTB install without monteverdi, mapla and gui application launchers.
 
+For Mac OSX you need to install XCode and Windows 7,8.1,10 requires MSVC 2015 or higher.
+
 You are now ready to compile OTB!
 Simply use the make command (other targets can be generated with CMake's \texttt{-G} option):
 \begin{verbatim}