Half-decent interop between the unix-y bits and the Win32 native bits. e.g., you might want to have a mostly unix-style build process that uses VC++ as the C c

Half-decent interop between the unix-y bits and the Win32 native bits. e.g., you might want to have a mostly unix-style build process that uses VC++ as the C compiler, and run it all inside Visual Studio using a makefile project.