cross version development

[gbburkhardt at aaahawk.com]

Does anyone have any pointers to guides for generating
executables that work on different
versions (not distributions, but versions) of Linux?  There
was, of course, a major
change in the glibc libraries over the last years.  In
particular, I'm trying to determine 
how to compile/link on Mandrake 9.1, and have it run on
Mandrake 8.1.  The glibc version
on Mandrake 9.1 is 2.3, and the version for Mandrake 8.1 is
2.2.  The libstdc library
versions are different, too.

Static linking is not an option, for other reasons.

Thanks.