[Boost-build] conditional feature on Microsoft compiler version?

Subject: [Boost-build] conditional feature on Microsoft compiler version?
From: Joshua Napoli (jnapoli_at_[hidden])
Date: 2008-10-05 15:23:16

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