Is there any way to make a feature conditional on the Microsoft compiler version. I want to write something like this:

<toolset>msvc-6.0:<include>spirit-1.6.4&&boost

Also, is there any way to ensure that one include feature is emitted before another? For example "<include>spirit&&boost" will output spirit and boost includes in order, but if another dependency has a plain "<include>boost", then boost will end up with two "-I" options, one preceeding and one following the "-Ispirit" (which is obviously not what I want).

Thanks,
Joshua