Setting up a cross-compile

[Dave Williss]

I'm sure there must be documentation somewhere on how to do this, but I 
can't find it.

I want to setup a Linux or Mac OS machine to compile and link programs 
for a Sun SPARC target. 
 
I know that gcc can be built to cross-compile for another platform, but 
apart from specifying the target architecture, I don't know what all I 
need to do.

One thing that I'm sure of is that when this gcc is called, I need it to 
ignore /usr/include and /usr/lib and pull things from some other 
directory where I will have to have copied the SPARC versions.  Is there 
a configuration option to tell it where those will be, or do I have to 
somehow override them at runtime?