Two glibc versions on one system ?

[Steinhauer Juergen <jsteinhauer@gmx.net>]

Hello!

I'm using slink and want to upgrade to libc6 2.1.
But I still need libc6 2.0 to compile my programs which
are based on the LEDA (www.mpi-sb.mpg.de/LEDA) library. 
This library uses the __setfpucw function (fpu_control.h) 
which isn`t (as far as I know) implemented in ver. 2.1.
Can I run the normal system with glibc 2.1 and compile the programs to
use glibc 2.0 ?
How do I configure the linker ? What libs from 2.0 do I need ?
I'm glad for every suggestion.

cu,
Juergen