iostream compatibility problems

[C++ Programming]

I am in the middle of porting one of my C++ project which is using old iostream (shipped with VC6.0) into new iostream implemented in stlport version 5.2
I found that some of the stream related methods are not available in the new iostream class.

The compiler gives me error for the following methods

streambuf::allocate()
streambuf::doallocate()
streambuf::blen()
ostream::osfx()
ostream::opfx()
streambuf::base()
streambuf::ebuf()
streambuf::setb()


Am I missing something?
Are there any *****alent methods available in new iostream library?
How can I substitute these functions when I port into new stlport/VS2008 iostream?

Thanks in advance

cheers
Varghese Paul