Upgrading a Redhat 5.2 system

[Pablo Frank]

I've been having some trouble with getting my Redhat 5.2 system upgraded to
using egcs and the glibc 2.1 library.  I'm trying to replace my default
compilers and libraries by using /usr as my top-level installation
directory.

I started by compiling egcs 1.1.1 with the latest version of binutils (19a I
think).  I then built the 2.1 library (with the add-ons).  Then following
the advice of the FAQ, I rebuilt egcs so that stdlib++ was rebuilt under the
new regime.  Despite all that, I'm getting bizarre seg faults with the
software that I'm working on.  I checked the FAQ again and noticed that I
might have to rebuild some of my older libraries that depend on libio.  What
libraries should I recompile to be on the safe side?  Have I left out any
crucial steps?

Pablo