PREFIX help

Could someone please clue me in on how to use these when 
cross-compiling?  Is there some docs somewhere that show this?

I am compiling on the build system with my install directory at 
/usr/local/arm/lib, which is the root of the cross-compiled file system. 
   If I tell konq/e to compile with libs at /usr/local/arm/lib, then 
konqueror looks for its libs there when it is run....  But if I tell it 
to use /lib, then the compile will fail because it finds incompatible 
libs (x86) there...

I am missing something, I know....  Is there a doc somewhere on how to 
use these?  What do others use in their config scripts?

Thanks,

--Yan

Installation directories:
   --prefix=PREFIX         install architecture-independent files in PREFIX
                           [the kde prefix]
   --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
                           [PREFIX]

Fine tuning of the installation directories:
   --bindir=DIR           user executables [EPREFIX/bin]
   --sbindir=DIR          system admin executables [EPREFIX/sbin]
   --libexecdir=DIR       program executables [EPREFIX/libexec]
   --datadir=DIR          read-only architecture-independent data 
[PREFIX/share]
   --sysconfdir=DIR       read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR   modifiable architecture-independent data 
[PREFIX/com]
   --localstatedir=DIR    modifiable single-machine data [PREFIX/var]
   --libdir=DIR           object code libraries [EPREFIX/lib]
   --includedir=DIR       C header files [PREFIX/include]
   --oldincludedir=DIR    C header files for non-gcc [/usr/include]
   --infodir=DIR          info documentation [PREFIX/info]
   --mandir=DIR           man documentation [PREFIX/man]