[boost] Is portability to pre-standard compiler an issue when considering addition to boost library

If code is proposed to be added to the boost library, and it can not compile on non-compliant (pre-standard) compiler, like VC++ 6.0, would that be a major factor for rejection? I have classes that are fully compliant to the C++ standard, but will not compile on VC++ 6.0, because 6.0 doesn't fully support template logic. Is this a factor in consideration for code addition to the boost library?