A good day to you, dear experts,

I am a newbie, I noticed in binutils or gcc there are lib and lib32 and lib64, to take binutils as an example,
My system is sgi IRIX6.5, which is suggested to use "n32" flag during the compiling and linking, is that mean that I need to use lib32?
Q1. which one should I use, lib or lib32 or both?
Q2. If it is lib32 that I have to link to, then how can I set it?
Q3. Do I need to do something after installing binutils, I mean what shall I do after "./configure --prefix=***; make; make install;", do I need to copy some special libraries for binutils and gcc?

Any help much appreciated!

Daniel